Hmm. So I am now noticing a few things.
1. The shadow is not correct. The shape could be bumped more towards reality, the gradient on the top should be softened, and a soft gradient added to extend to the right.
2. Although, I have artificially controlled my edges and added a bit of an overall gradient to help with composition and draw the eye to the canister, I note that the table edge between the background and the shadow is at its sharpest, and possibly its brightest. This combined with the darkness of the shadow creates a "feature" in that strip of table which draws the eye.
So, an area which is somewhat unimportant and also a bit off is grabbing some attention from the rest of the canister.
I have done a composition based rework before... perhaps I will touch this one up also.
Thank you for bringing a fresh eye and bringing this to my attention.