Aliens can look human, The Doctor is an alien and he looks human. Superman's an alien and he looks human. She looks like she's not what she seems, like this is just a disguise or she's going to shape-shift into something else, I think it's the red eyes that give her away.
"Doctor: No, I don't look human, you look timelord. We came first !"
So , yeah she looks very human, even if her Skin looks abit like plastiv , her eyes are kinda scary red and she uses some kind of light-dagger , yes she has ahuman form. But that doesnt mean she has do be human. Don't judge a book by its cover folks I love this piece of artwork.
Nice though she doesn't look to alien, no extra parts, no powers,ect. She does seem to have a bit diffrent skin color though. Don't get me wrong I like the pic and think she looks beautiful, yet unless she can change into something else I don't think she really looks to alien, yet that's just my take.