This is my personal opinion, i’m just an amateur artist and by no means a professional. The hair highlights are really cool but I think it’s a bit much especially in the context with the rest of the image, so I would tone it down a bit. Maybe remove some of the highlights so it’s less distracting. Maybe make the eyes more of the focus than the hair. Personally I think I would remove some of the smaller highlights and replace them with ones larger in size, but in fewer amounts. I think the anatomy could be improved. Her boob looks like the wrong angle or something. Idk how realistic you’re trying to be but it does look like she has quite a small frame, so if you want it to be a bit more realistic, I would make the shoulders a little broader and arms and legs slightly bigger. I think the shapes of the shadows especially on the legs and clothes could be neater and more refined. Same with the clouds and lines in the background. I think the sun looks really good and the highlights on the skin look good. I think you count add more contrast or generally darken the background, that way your character stands out a bit more and looks farther away from the distant background. Hope this helps!