Would love any advice to make this better

Give me a bit more information like, what she is, what your intention is for the piece, what she's doing, intention being something like=i want to portray a powerful female relay runner from ancient Greek times in a (manga or realistic or poster style) illustration. After I get that Ill do a paint over over and help out.

Hi @nickhoo what you are feeling is actually a common thing so don't stress. The feeling of not getting better is tied to the fact that your eyes (art knowledge , being able to pick up on mistakes ect) and hands (mechanical skills and techniques,) mature at different rates. A time feeling like your work is just getting worse is your eyes and knowledge progressing faster than your technique which will eventually catch up as time goes on. Sorry for the wall of text but it's a common issue that you will face your entire life as an artist and it's handy to know about it sooner rather than later.

Now onto crit for the piece. The anatomy of the neck down seems pretty solid with proportions and the pose overall. Your head anatomy however needs works. The hair line is half way down the forehead, the ears are to high they should align with the top of the eyes and bottom of the nose as a general rule. The hair could also do with loose strands and details that don't make it so uniform.

I would suggest looking up the Proko series and vid on how to draw heads from all angles and to get a better grasp on the form. I think Cubebrush might also have a vid on this subject.

Great work overall and a desire to improve and look for crit is amazing and will help you rapidly improve.

Also I'm right that it's Rey from starwars right

You should work on gestures. The firgure looks too stiff and kinda awkward. Also the left hand should not be turned that way. Try the pose yourself and see if it works -- that is the next step to improving: being able to "feel" the poses you draw. --
also, her head seems to be twisted a little too much. And if she is running, for the sake not falling on her face, the right leg should be forward.

And in order to detect other errors, reverse the image back and forth and the mistakes will become obvious.

Hi! You've had crits on gesture/pose, so I don't have much to add there.

Your rendering is pretty nice, but a bit inconsistent in places. The face is rendered a 100%, while her weapon is quite flat and you see the paint strokes on her skirt. Not that strokes are wrong, but try to stay consistent.
The most off-putting for me is the uber shiny hair. I also think you don't have to paint in so many tiny strokes - it breaks with the paint style.
You could also work on the face - with the nose and ears being placed too high. I think the large eyes are a style choice, but I'd make them smaller nonetheless.
Lastly, you seem to have a lot of light sources and I wouldn't expect that rim light everywhere (on the bottom of her right arm for example?).

Keep it up, you're on the right track

The clothing is quite okay actually! Just try to stay consistent in rendering ^_^
Proko definitely!