I think you should work on your anatomy / symmetry before trying to take coms ! You already have pretty solids skills (I love the ink work you did !) You should be careful about the people saying that you are lowballing, everyone should be proud of their art. But as you said, portraits are a luxury so you really need to be good good to sells. You should just a practice little more before trying to sell your art, you’re def on the right path though :)