My critique: At first I didn't realize what game it was because the bokeh/bubbles are dominant especially considering how bright it is. Consider bringing it down, the exposure/brightness is a little high. Overall great job I like it. Assassin's Creed ftw, just finished Brotherhood tonight.
You should definately post video tutorials on youtube! That would be amazing! I'm trying to get better at designing, but I just don't get how people put together the abstract feeling of it, the colors, etc..