[King Rudi]

When picking up the paint, make sure you get gloss. I might be wrong here, but it looks like semi-gloss. If you get matte, flat, egg shell, etc, it will be very noticeable over that sheen. As far as everyone else's recommendations, they are spot on. Get some drywall mud, cover the area/fill the holes. Wait for it to dry, sand, but not too much, then paint.

For future reference, don't put stickers on walls. You can continue to hang your bike rack, just make sure to use the drywall anchors that I suggested in the other thread of yours. Anchors will leave bigger holes, but same process - mud, sand, paint.