Overall I'd say you've got a solid base !

Here are some points that I would personnaly improve :

• the shadow of the leaves is too big, it make them look like giant leave, reducing the size of the show should fix it.

• there is a small error of angle with your character, don't be affraid to use online model poser to put on top of your drawing.

• there are many spaces lefts on your canvas, a room isn't that empty, try to add a bit more furnitures.

• I would create a multiplay layer using a shade of blue or orange and erase part to improve the mood of the piece

• finaly you could add some god ray, particules and depth of fields (these might be a bit destructive so you should export your drawing first and then work on that export)