Here's a quick little sketch of the outline of the character's head. On the left is the outline traced over your drawing, the one on the right is a front-facing view based on your drawing.
You can see that the eyes are a little wonky, and the positioning of the horns are too far to the right side of the skull. The right horn is placed behind the right eye, while the left horn looks to be placed directly above the left eye. This gives the impression that the horns are placed in two different spots.
I sketched up some rough improvements. It's pretty sloppy but hopefully you get the idea.
(I placed the left horn on the 3/4 view head too far to the right.)
Anyway, hopefully this should give you a good idea of what could be fixed when it comes to facial proportions. As a rough guideline, the eyes should be placed halfway down the head, the nose halfway between the chin and the eyes, and the mouth halfway between the chin and the nose.
The eyes should be one eye-length apart, and the width of the nose and mouth are about one eye-length.
All these proportions (especially where the eyes are located, and the size of the nose) can be tweaked and adjusted based on your character's anatomy, but these are good guidelines for a very average-looking man or woman.
Hope this helps a little! Keep us updated