A little poofy looking at 1X. Yusuke has a black pixel on the arm. They seem like they're wearing baggy/fluffy pants the way the lighting is applied. Your skin tones are excellent, though Yusuke's yellow tank top doesn't stand out enough. The foot positions on Hiei seem a little strange. Legs seem a little small on all of them, but that could be a style thing based on the anime. Just something to think about. Your Kurama looks good so far. Perhaps you can use fewer shades on the clothing for all of the figures and still get a good look...
Not ever seeing this anime before, here is how I would consider coloring Kurama:
