Hello Umar,
I am about in the same situation as teconsite.
I would suspect that the search engine will ignore the ?itok token because it's a well known URL parameter and therefore the search engines will assume that they mustn't take it into account. Or do you think, they will consider image.jpg?itok=1 and image.jpg?itok=2 as two different images?
Would it make sens to specify this in the Search Console/GWT as URL parameter?
Thanks for your help in advance!