nice shading! :D

Nice! Heres a tip: Get some darker gray, and then lower the (opacity/how see-through it is) to somewhere between 0.06 to 0.01, and get the tool that is next to the highlighter/yellow pen, and... actually theres some tutorials out there

Um, kinda better than the last one, but try to shade like in the last one, and dont cross out of the line of the circle.