It may be a light artifact, but it looks like you have some chips holding the skin away. Drill the rivets out, use a chip chaser to clean the area out until the skins lay flat, then rivet again. Sometimes clecos aren't enough and you will have to clamp on either side of the rivet, using a narrower bar and set (or a rivet squeezer) to do the rivet.
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
EAA Technical Counselor #5357