Emily we should trade, like you teach me how to do Illustrator and I give you oil advice. That's pretty stellar for a first ever oil painting. I will have to post some photos of my recent stuff. But at least for me I just try to build up layers, which I am sure you did.
I'd say just get a little more daring with your contrast, put in some more darks in the shadows. With oils I find what makes for nice flesh shadows are just using red and blue... like put the red on first blend it a little, then add blue and you get a nice purple, it depends on what look you're going for.
The features look a little unbalanced, and everything isn't about photo realism, but even if you're not going for photo realism, balance and proportion still only enhance the looks of things.
What are the dimensions?
What are you using to thin your paint?