Hi Eduard! Cute chipmunk! Definitely doesn’t look like anything more can fit in those cheeks! I think if the fly were facing us or facing the chipmunk it would be worth keeping as that could look intentional but since it’s a rear view I would probably remove the fly if it were mine. Nice capture of the chipmunk!
Great subject, I really like the expanded cheeks of Chipmunk and bright eyes. Unless there is some relation or story with the fly, it can be removed and composition can be improved upon.