This is a great idea you have here. I have setup many cons in my time so I know how they can be, so that was a good way of showcasing what happens and the good times people have dressing up in cosplay. I love the additon of the coca cola and the comic-con bag so you know they are chilling there and having a good time. The coloring and blending with your brushes is wonderful. I do love the darker tones of color to bring out that con feeling of low light and crowds. I think your diversity in the people is also good and shows that we all love to be fans together.
~~THINGS TO IMPROVE ON~~
Nothing to change, love this as it is.