No wonder this hurts, the position is soooo impossible... ;-)

I can't be of much help in anatomy, but at least the left finger is seen from the side: very wrong; the hand itself is too narrow; joints are too wide, nails too big.

Or else, it's an alien!

 The fingers look a little weird, but it's really well achieved, i love it!

woooooah i started something scarily similar to this like a year ago, never finished, but it was a giant RGB hand. haha

nice work tho, the fingers look a tad long and they connect kind of weirdly.