Nice work! For your first tablet drawing you're doing very very well! You have extremely steady lines which is something many people struggle with, especially when they're new to using tablets. Your coloring is nice, though a bit cloudy, it could afford to follow the form more to give a stronger sense of solidity. The composition is good too, but with the hand so directly facing the camera and with such strong forshortening, the hand should be much larger. Overall great work, keep it up!