Fox's doodles

[Fox]

Haven't drawn anything in a long while but maybe by posting my old stuff I'll get back into it. This first one is one of the enemies from the game I-Ninja, saw it in a magazine and drew it from memory (couple of years old now). This was a basic manga tutorial I followed. Couple of errors in this one. Sorry about the size. They're scans, and I'm not sure how to resize them. Any suggestions for improvement?