Could have been better. It doesn't really look that much like a vector. More like you used posterize and put a few filters on. I've been away from gfx for a while and I'm about to make a return, I'm currently work on a vector that I started earlier today. I mostly do vectoring and trying to improve.
Well it would be a shame if it was just the cutout filter... If not then some suggestions would be to darken the hand a little, especially around the thumb on the right hand so it shows better.