[lecarore]

I've had a look, it's pretty great stuff. The gamification is a nice plus (the quizz at least, i'm not sure about the "coins" thing ^^). I guess generating content is for this is quite time consuming, but it's a nice goal. I'm not sure if there's a lot of similar websites on the internet, do you have some serious concurrence ? You could post it on the photography stackexchange site (probably in the meta) to ask for some help. I once made a small answer on the role of a beauty dish (https://is.gd/VHkS7t) and could help you on the lighting topic.

I'd suggest avoiding the "before / after" js thingy for the zoom pictures. Everybody knows what zoom does, and the sliding system only makes sense to me when showing variations of the same image.

Make sure to make it ready for internationalization also :)