interesting form of art... usually, people color them as realistic as possible, yet this guy did something else... it looks as if painted with non-waterproof paint and then brushed away with water... it is a very interesting and indeed unique style...
THis is absolutely no offense. It is not the way I prefer to color or prefer to watch (i like realism more than abstract), but I've rarely seen abstract covers of Naruto in my life. This is probably the third one or so.
In a way, you did almost everything corectly, but I think you want to color realistic, such as the other artists at this forum. In that case you have a long way to go, but good try.
In the abstract way, as I said earlier, it is very nice. It is really something to be proud of. I want to see another artwork like this from you (abstract way)

Seriously, I mean so.