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Do you know if I have to consider the inbound links from OSE or WMT?

Hi Timothy - the rank tracker tool has been working the past few months, but is, sadly, once again down for maintenance (as per http://www.seomoz.org/dp/rank-tracker-update). That said, the PRO web app - http://pro.seomoz.org - is still working and can show keyword rankings history. If you're looking for a purely free, on-demand rank tracking tool, we recommend SEOBook's: http://www.seomoz.org/dp/rank-tracker-update Cheers!

Questions: how can I know if my website www.loveandlucky.com is penalized how can I find out which of my incoming links are unnatural links? thanks! PD: I already removed my blog website from header and footer,

I think that would be an awesome addition to the already awesome set of tools!

Can you redirect those pages to some relevant category pages on the site?  The 301 may help in this situation.   Ideally you need to find out where the internal links are a eliminate them. The 4xx errors arent the worst, and those pages should get de-indexed eventually.  Also make sure the xml sitemap it updated with the proper urls and those old ones arent in there anymore.

Movement from position 1 to position 4 is not that unusual. I imagine this has caused a subastatntial drop in traffic as the CTR tends to drop sharply after position 3, but I wouldn't consider this a dramatic drop in rankings caused by problems with your backlinks. It is possible that some backlinks might be devalued by Google which has caused a small drop, More likely this is caused by a Panda update. Panda wasn't a one time update, and this Search Engine Watch article suggests an update around the time of your drop (http://searchenginewatch.com/article/2080631/Google-Quietly-Launches-Panda-Update-Version-2.2). This probably means that Google sees your content as a little weaker than your competitors. Based on this, I don't think you need to make any major changes. Try to get some more good content up on your site. And I'm not sure how active you are in the social realm, but more social engagement (I suspect Google is a big fan of +1's) could help. I'm not sure if your on-page efforts are also limited to two keywords, but if so, I'd consider expanding that a bit. Diversification will make your traffic and revenue less susceptible to fluxuations like this. Moving into the social media will also give you another way to produce traffic that isn't reliant on SEO, while usually increasing the efforts of your SEO.