Hi, so there are a few things that are weird that can be adjusted. Before I go into that, I'd like to say that I very much like what you are going for, and I hope that this doesn't sound harsh.
So, I'll start with composition. There is a lot of lines here, that just doesn't compliment the rule of thirds and that don't really lead anywhere. The red lines show the golden ratio, and you want to redirect our focus to as close to one of these four red dots as possible. You're sort of close, and this is an easy fix as you already have a lot of "empty" space around the canvas, so it would be easy to simply resize the painting to fit into this. So, there are a lot of good things in the composition, most of the lines do lead into the main focus, the hand, which leads up to her face. I think there might be a bit too much hair below the hand. It drags our eyes back into the hand, which is what we want--but the line made by the cliff behind the character, does that as well. So that is a possibility to reduce cluster, which as you said, there is a bit of.
You're going to need do some perspective work, as right now, it is kind of messy. I could not entirely see what was going on at first glance, which is a big problem as readability is very very important. So, this is due to this big hand that looks like some rocky formation? you might need to work on the shapes of that, but most importantly, you need to do look into perspective. At first glance, I was unsure if this was foreshortening done wrong, or if her hand was big. This is likely a mixture of both, which would require some attention.
The nest looks flat, as if we're viewing it from above. There are problems with the background as well, what shapes are really happening there? define them and make them sense of them with perspective.
As for the character, she has somewhat of a natural pose. It looks a bit weird because her limbs are going into the wall, which is her power and I can't really fault it. Besides that, it looks very nice--Except for the foot, which is really stiff and doesn't make sense. It looks like you were trying to make it stand up a bit, but it looks like its grounded and we're looking at it from above, again. This shouldn't be the case, as we should view more of the side of her foot than the top. At least based on her leg.
My last issue with this would be the values, which are lacking and are affecting the overall composition. Light and dark are a part of the composition, and they matter, even before going into colors. As the painting stands, you have taken some advantage of this by using the cliff light to contrast the dark rocky hand, which is the main focus of the picture. However, there are a lot of grays in the painting, and things remain vaguely defined. For this, I just think you need to really get in there and create the shapes properly so you can get more than just some blurry gray. A big portion of this can be fixed with the previous solution of cutting some of the edges and bringing the character closer.
This would be a quick example of that. I would suggest you to have more contrast, but I think that would only work if you figured out your shapes first. Besides that, this is an interesting piece. Your character has some gear, simple clothing, and a bird friend. Hope this was helpful! 
