Wow! Your stuff is really good. You have some issues with anatomy, the man injecting a vynil cable could use a more dynamic pose and the second one, the girl's face, seems a bit wrong - try flipping your canvas horizontally to view any anatomy problems that might not be obvious. You do however have some amazing rendering skills, either in digital or with the pencil, keep up with the great work.
My advice: do some drawing from life or photos to get more dynamic poses.