Angry women with knives

Sword-dancer
Medium: Mechanical pencil, Photoshop
Bit of a recurring theme, really. Maybe I should get some professional help or something. In any case, I need lots of practice with digital art and this was the first sketch I had lying around. Comments or criticisms accepted.

Lunchtime Sketches VIII

Mermaid
Medium: Pencil
Don't like this one much. For some reason, even her expression was irritating me by the end of it. Mental note: scales = painful. How many times must I learn this simple lesson?