A painting fell and made a tiny scrape. I thought I could fix it but I made it worse. The paint I used matches but when you look on the side view it looks way to white. I sanded it down cause I panicked so now its super smooth. I don't want to get in trouble by my landlord.
I bet the problem is just a slight mismatch in the sheen of the old and new paint. Color and sheen can change on old paint as it ages. As long as the color match is pretty good, paint the whole wall with your matching paint. Once the whole wall is the same color and sheen, it'll be indistinguishable.