Naruto's hair could be better, however it actually looks pretty good in sketches of him without his head band. It would be boring if it was just a copy of Minato's. Kishimoto could have deviated from the orange color scheme as well, at least we're seeing less of it now. Lol He gets a pass from me.
Sasuke ... looks like a typical rat-on-the-street drug dealer. I like his former designs more. The current one looks horrible imo. The chains are too much and the bandanna is out of place too. I don't really see what Kishimoto was going for here. It's just lame, ugly, and not professional (I thought it'd be more put together considering what a serious character he is). Hopefully when we see a full-shot, he'll at least have made a step in the right direction and gotten rid of Orochimaru's purple up-bow that hints his close relationship to him. :|
Then again, the only design I completely approve of is ironically enough TenTen's. XD