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Did you implement something lately? Just asking, because interesting fact is, that you have quite an old cache for this page only (31st of March). On other pages you have a fresher cache in Google.
Nor Majestic or Moz doesn't show any links towards this page, so it could not be influenced by that.
Did you try fetching it from Google Webmaster tools?
That Kumar guy is funny. We also had to deal with him in the past. He asks for a certain amount of money /links removed.
We have tried talking to him first, in order to remove the urls. But in the end his websites ended up in our disavow file. (and his response was: I do not care)
Keszi
SEO tools are like personal assistants:
That is my shortlist 
I personally use Screaming Frog + Moz, + Majestic + Xovi
I hope this helps.
Gr., Keszi
Hey,
Meanwhile Dan gave you quite a nice answer below.
Gr., Keszi
Shaq, the reason it is not higher is, because it wasn't updated at all since 2013.
Regarding DA, check again the http://moz.com/learn/seo/domain-authority link that I have provided in my previous answer.
Moz clearly states, that you can not directly(or it can be a hard task to) influence this metric (check the SEO best practices part in the bottom of the article).
Quote:
"Unlike other SEO metrics, Domain Authority is difficult to influence directly. It is made up of an aggregate of metrics (MozRank, MozTrust, link profile, and more) that each have an impact on this score. This was done intentionally; this metric is meant to approximate how competitive a given site is in Google.com. Since Google takes a lot of factors into account, a metric that tries to calculate it must incorporate a lot of factors, as well.
The best way to influence this metric is to improve your overall SEO. In particular, you should focus on your link profile—which influences MozRank and MozTrust—by getting more links from other well-linked-to pages."
As Alick300 has mentioned, Pagerank is a metric that we do not use anymore.
I would advise you to check the metrics that Moz is using: PA, DA, mR, DmR, and in case you are a Pro member, you could also check mT and DmT:
Be aware that these are only metrics and in some cases increasing these metrics doesn't necessarily mean that you will rank better: Correlation <> Causation (check the article I have linked into the spam score, by Rand).
Also you could check the whiteboard Friday: http://moz.com/blog/understanding-and-applying-mozs-spam-score-metric-whiteboard-friday
I hope this will be helpful to you.
Keszi
No worries! I have digged into the canonicals questions so many times, thought I will clarify.
Basically in me belief canonical links are a two edged weapon; if miss-used, they can lead to a total disaster.
What I would add to Lewis's answer, just to make it clear, canonicals do pass link juice. If you are interested, you can check this article from Dr. Pete: http://moz.com/blog/an-seos-guide-to-http-status-codes
But for sure the 301 would be the best practice in your case. Because there would be no good use to have the pictures on 2 urls (the kws and the non kws versions).
I hope this helps.
Keszi
Hey,
there are so many things that could influence your rankings that is hard to tell if it is only from the links, or there are other factors also.
If you see a traffic drop from a specific date, then you could check for the Panguin tool from Barracuda: http://www.barracuda-digital.co.uk/panguin-tool/
And if the traffic drop is on a specific update date, then you could investigate that specific update, and start from there.
Let me know, if you have further questions.
Keszi
What I would try out, is including a self reference also.
So next to your hreflang there would appear a new hreflang, such as:
When we have implemented hreflang, we have also used a self reference, and I do not have any issues there.
I hope that helps.
Keszi
Hi,
Try out your page with Flang tool. Maybe it will give a better insight what you are missing out.
We cannot do more without a link that we can inspect
BTW: common mistake, do you have a self reference? It is needed in order to hreflang to work well.
Keszi
Try getting back to the basics. Create an audit for the website, for the webpages that you'd like to rank for. Check for accessibility.
For example on one of our projects a simple development error caused our new content to be hidden from search engines (a simple content tab that had an issue with Javascript).
Sometimes getting back to the basics and creating an auditing for our website could highlight issues that stop us from ranking on top 10 spots.
Domain Authority (DA) - indicates how likely a domain is to rank based on how authoritative search engines consider it to be based on its backlink profile.
Page Authority (PA) - indicates how likely a page is to rank based on how authoritative search engines consider it to be because of which sites link to it
I have quoted these from the Moz Glossary.
It is important to highlight the usage of the word Likely! Having higher DA or PA doesn't necessary mean, that you are going to outrank a specific website. DA and PA are mostly based upon the links that a specific website/webpage get. (at least this is how I look at it).
There are so many other things that could influence a webpage's rankings.
I hope it helped,
Keszi
My favorite for yesterday came from Barry Scwartz: https://www.seroundtable.com/google-search-quality-lead-april-fools-20084.html
I was crying out loud while reading this. 
In any case, I would recommend an onsite audit. You can do it yourself, or ask an outsider in order to get a fresh perspective of your website.
Let me know, if you need help.
Greetings, Keszi
Yes, Wordpress SEO is the Yoast plugin: https://wordpress.org/plugins/wordpress-seo/
Oh, sorry. My eyes run over the site: search. You have only blocked the emailer. My bad