Your style is quite expressive, and you use some fantastic colors. The contrast between all of your colors has the rather striking effect of making even the ordinary, everyday objects in your drawings appear surreal. Not that you have many of those. All of your concepts are great, and you execute your ideas well. Your imagery consistently and effectively conveys both the ideas you're trying to express and the mood you're trying to create. Speaking of which, the mood you create in all of your drawings is a unique and poignant one. It's surreal yet purposeful.
My advice to you is to beware of muddy colors. As I said, you have some great colors. But you also have places where you're trying to mix too many colors or colors that don't really mix well, and the result is muddiness and dullness. Most areas are fine but this does show up in some of the objects' corners and edges and some of the darker shadows. I suggest just being a little more careful laying your pencil strokes down and being a little more conscious of which colors are meeting each other where.