looks perfectly digital to me.
I don't know what that guy two places below me meant, because the fact that it's so shiny and perfectly highlighted is the best aspect of this piece.
But...there are some minor faults.
i'm not trying to say I can draw better, because I totally can't (really really can't), but the form of the boobs look a bit off, and it looks like you had a hard time drawing them on your drawing tablet. maybe you would get a better result if you tried to let them interact more with the chest.
Also her left ear thingy looks like it's hanging a bit too low.
And last: her legs are not shapely enough: a woman should have more curvyer forms. But i dunno, that could also be your style, since it kinda contributes to anime-themed atmosphere.