Nico, it's not a photographer's account. It is an illustrator's. Now that I've examined your example, I have no faith whatsoever that those brilliant illustrations in his portfolio are entirely his. If he made a sillhouette out of your cricket player, I can't believe that he made any other figure from scratch. It dissapoints me bigtime. I had to hold back from posting a comment to the image that said "YOU THIEF!!! YOU STOLE THIS FROM NICO SMIT!!!!!"
If he only had a few in his port, I would think that oh, he's a beginner and doesn't understand copyrights etc. This guy has 98 pages of illustrations! He knows exactly what he's doing!!!!
Yes, I say do something. I don't know what... I'd think go straight to StockXpert (98 pages of illustrations...)