I can say that I like the style you have in the hair of the male sprite.
The female does need a bit of work, I say give her rougher eyelashes, and make sure they stick out more at the edges, to give it that, like "I'm so hot" girl feel to it. I have no clue why, honestly, but I think that would make it look more female.
[Offtopic]
But, I love the design you've put into the walls, it looks dirty, which looks best in most games.