Perspective, uncomfortable leg position, center of gravity. The head/chest perspective seems to suggest a rabbit's eye view of the robot, but the feet are straight-on and in a strange mid-sitting position which is transitional and not a good pinup shot. The robot is right now off-centre and leaning back, looks like it's dodging something. All these things can be fixed by changing the legs, especially the right leg. The crop is't very good either, I'd put robo and 2308 on the same line and move the whole scene higher so I can draw the full legs also for two reasons: robot legs are fun, and 2: it's a sign of amateurism to cut off characters at the ankles.