Cool art so far. Next time, you you actually post the pictures on here, it's kind of a pain going from link to link and I can't the third one.
On the first picture, the arm on the right is shaped a little strangely. I'd try to make is more symmetrical with the other arm.
On the profile face of the last picture, the chin is extremely large and the ear is a little too far back.
Keep up the good work and welcome to MT! Glad you could join us!