It's hard to tell what material the headpiece is supposed to be, since it's just soft blended and has weird edges. The part closest to the head looks good, the part above that not so much. The neck reads as hollow to me, like, hollow and thin, almost like it was made of aluminum foil. I like the face, it has an interesting shape and features, but is that a plate that it's resting on? It seems like the head is spilling out down under the plate. Unless that's his hand. But the other hand is wearing a glove( or at least, has different colors), so the thing under the plate doesn't read as a hand, since it has such a similar color to the head.
The background value is okay, but it has a very similar hue to the rest of the image, sort of negating the contrast you could have had.
All of this is of course subjective, and I'm not a professional.
Looking forward to seeing more from you.