Very nice sense of scale with all of the detailing. Makes it feel very realistic. Great Job!
Like others have said, the ratios of the hand seem off. The thumb is stubby, yes, but I also would say the medial phalanges of the index and Middle fingers are a little long too. Here are a couple observations I've made (and I'm sure so many others have made as well) which help me maintain nice human looking hands and keep away from E.T. or Chimp hands, lol:
Take a look at this xray of the hand
. Speaking in general terms, the proximal phalanx of each of the fingers is almost
the length of the medial and distal combined. So in this model's case, I don't think that ratio is matching up quite right. And then, once the finger length is established, the tip of the thumb will normally fall within the second half of the proximal phalanx of the index finger when swung up beside it. There is a bit of variance to that thumb rule, I've seen. For instance, my thumb is longer and lines up with the second knuckle, however, I know people with that "toe-thumb" thing going on, and they have a similar ratio as your model does. So really, I guess what you have currently with the thumb and length of fingers is within the realm of possibility respectively, but when combined; short thumb with long fingers, it looks strange.