Engineer’s the expert in this field (:wink-wink) but as far as the two Gopher Gold screenshots are concerned: the ‘copied’ one shows ‘River Belle’ in the bottom corner. Even if he’s doctored it, it would be hard to prove. Maybe you should take a leaf from the scraper’s book and put a watermark on your images.
It’s a pain when you take the time to Photoshop your images and then someone comes along and just plain copies it, but it’s not always intentional theft: Google Images can show images from your site which people often think are in the public domain.
Legally, though, it’s hard to prove you ‘own’ what is essentially a photograph of someone else’s (ie Microgaming’s) work.
As for text, it’s only obvious when people use a significant chunk of your own unique phrasing. In this case, though, it’s word for word so it’s quite clear! So long as you can prove you had it first, report it to the site owner and the relevant affiliate manager.