Lots to love about this MOC!
Market stalls - great style and I like the use of the flags as a roof. The snow on the dark red one looks great too.
Fountain - clean look and good scale. I'm glad that you finished the top w/ dark gray tiles to provide some contrast from the gray courtyard
Building - Has a very "Derfel Cadarn-ian" feel to it. Looks good, and all of the doors on the MOC are really nice.
Minifigs - Posing is very good. Plenty of action but not too crowded. Also, you've turned most of the figs so that you can see their faces, which is good.
Courtyard - a bit too uniform for my taste, but nice job offsetting the 'cracks' to create a little bit of texture.
Photo - As you said, maybe could benefit from a better camera, but overall pretty good. A little more time in a photo-editing program to really clean it up would make it top notch. Probably a little too intense for someone just getting into photo editing, but GIMP is a terrific free program that lets you do a lot. Eventually, I'd recommend working your way up to it.
By far your best build yet!! Keep up the good work!