Better than what I've done so far, as you're already into the angles and proportions XD.
As for suggestions...here are a few:
Pic 1: Left side Minato needs to have his feet proportionate to his body, even if they happen to be a bit further back, they still look a bit narrow. Same for the back arm on that guy, and his kunai are a bit small, as well as quite blunt looking (fine tuning on those could always be done at the end, there are plenty of pics on the internet that could help with research on those). As for the face, I'm also a bit stumped on how to make one for that angle, the best I can do for you there is say....try something along these lines (
http://i61.tinypic.com/28k53jn.jpg). I worked off of these images for those (
http://tinypic.com/view.php?pic=14b02h3&s=8#.VWsYnUbw8g8), but it's important to note that the jawline ends at a certain point, and the ear is usually just behind the jawline, just a bit above it. Again, further reference to Naruto pics on the internet would be advised, Naruto himself is a good research point as his ears are usually visible. The nose is, unfortunately, also an area I myself am stumped on, but again ref pics on the net should help you out. You seem to have a bit more skill and less hesitance with drawing than myself, so I can't really say much more beyond that, the rest is really up to you at this point.
Pic 2: Madara's close-up nose makes him look a bit cat-like, further net refs are advised there (again, not so good with the noses myself, still working on trying to make them look good). Ankles and wrists look a bit too small for his body, so some touching up could be done there next time. His upper body also looks a bit too flabby, but that might just be the angle that he was drawn at...and his lower torso seems to be having some trouble matching his upper torso. As for the rest, it looks pretty good, and I'll wait for your next pics before I start critiquing again.
Hope this helps, I know I was a bit vague on most of it, but drawing really is meant to be explored by one's self, with the occasional help of a passerby who already has a few shortcuts on their map.
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