@chachaarts Yeah seriously ease back on the self hate, dude! There's being open to constructive criticism and then there's saying "Be mean, it deserves shame"... Like what even. Especially since the painting really isn't that bad, so imagine anyone below your level hearing you talk like this about your skills, how shitty it must make them feel about theirs Pro tip: self-loathing is unhealthy and rarely leads to improvement.
The hand is a bit big and the mouth seems a bit high and not quite centered. But with faces, it's so precise that it doesn't take much before it starts looking completely out of whack. I suggest practicing with things other than faces to begin with, like objects and full bodies. Spend more time nailing the sketch or underpainting before you start painting to really get your proportions right. That includes stepping back to see the painting smaller, and taking a photo and flipping it on your phone to see how it looks from a different angle - all the flaws your brain has gotten used to usually just become so obvious then.
And most of all be kind to yourself. This is a new media and it will take you time to feel more comfortable. But trying to shame yourself into improving will never work, it will just suck all the joy out of the process until you're literally unable to force yourself to paint anymore. Don't do that to yourself!