That looks really competent!
Full colour up-close portraits are challenging at the best of times for me. It's one of the areas where I find I can spend HOURS noodling around before I get something I can stand back from without totally cringing.
I guess that's a good thing; it's always nice to have a challenge wall to push against.
Anyway.., have you ever tried Clip Studio Paint?
I tried Krita, and while the software package is nicely laid out and has lots of great tools, my computer was having trouble with it; fast strokes on a big canvas resulted in cursor lag which drove me nuts. -Other users haven't had the same problem, so I don't know what the issue was. Maybe something bunging up my OS..? -My computer should be fast enough. Either way.., Bummer!
Luckily Clip Studio Paint works really well on my system. It's lovely to draw with; it has an excellent brush engine which puts it head and shoulders above the crunchy-line Photoshop when it comes to inking line-work for comics. Unfortunately, it's also paid software, but still far less expensive than Adobe products. (I got my copy for around $50 on sale.)
RE: Bird (Work In Progress)