It's difficult to tell, what you could try to improve with this picture, because it's surrealism and you didn't explain, what you want to show to the viewer.
So there are only some minor things to tell, like you chose shadings from different directions. The boy has the light a bit left behind himself, because of the shadow in front of him, but the lady has the light on the right side in front of her, because of the shadow-parts in her face on the other side. That's a bit confusing in my eyes.
It seems to me, that both of them has to have realistic parts like the head and half of the body. If so, the ladys head has a nice face, but her head/hair is flat and the neck/shoulders not in right position. The boy is well done with only his thigh a bit too big in relation the the rest of the body and the corpus is painted straight, but in this position it should be a bit twisted.
Well, I'm still learning, too (but watching and talking about it is easier, than doing it). I like the possibility of using different layers to do some experiments with changings. If it's near to what I want, I combine them (or delete the layer, without loosing the rest of the painting). This way, it's easy to move a person, a tree, a boulder or whatever untill everything is okay for you (and you don't erase parts of the background).
This way you can do the trees, too. First layer with trunk and branches, next one with dark leaves, next one with lighter effects. If you want another branch you don't need to redo the leaves there and same with darker aereas, more or less leaves. And when it's okay for you â€" combine the layers to get one layer with the completed tree.
I tried doing some of the things I told about (only to learn about it myself) â€" maybe it is of some use and hopefully the direction you are looking for:
So there are only some minor things to tell, like you chose shadings from different directions. The boy has the light a bit left behind himself, because of the shadow in front of him, but the lady has the light on the right side in front of her, because of the shadow-parts in her face on the other side. That's a bit confusing in my eyes.
It seems to me, that both of them has to have realistic parts like the head and half of the body. If so, the ladys head has a nice face, but her head/hair is flat and the neck/shoulders not in right position. The boy is well done with only his thigh a bit too big in relation the the rest of the body and the corpus is painted straight, but in this position it should be a bit twisted.
Well, I'm still learning, too (but watching and talking about it is easier, than doing it). I like the possibility of using different layers to do some experiments with changings. If it's near to what I want, I combine them (or delete the layer, without loosing the rest of the painting). This way, it's easy to move a person, a tree, a boulder or whatever untill everything is okay for you (and you don't erase parts of the background).
This way you can do the trees, too. First layer with trunk and branches, next one with dark leaves, next one with lighter effects. If you want another branch you don't need to redo the leaves there and same with darker aereas, more or less leaves. And when it's okay for you â€" combine the layers to get one layer with the completed tree.
I tried doing some of the things I told about (only to learn about it myself) â€" maybe it is of some use and hopefully the direction you are looking for:
)?
) 
. They just read:
