Cecilia - Line Art

I've been learning how to draw in SAI instead of OpenCanvas 1.1, this is a piece I'm on and off again working on as I practice how to use line thickening and what not. I think I'm done with it (for now).

The character is Cecilia, she's from a story I've had in my head for many years now but has only recently been granted a face (finally).

If you've any tips you'd like to share be my guest, as I'm always open to information about this crazy program and the art I will draw in it.