I agree, the signature needs to be thought out. I've reviewed some of my earlier works and shake my head--when I first started out, I signed everything in one color (a blue) and always in the right corner....and sometimes, it stuck out. It was one of the first things I notice now....not always in a good way. I think signatures should be on there but in a place where they are noticeable is you're looking but not distracting from the painting. These days, most of the time, I do not "paint" my signature on but sign it into the wet paint (I paint in oils) with a pointed rubber tool or a small stylus. This typically "blends" it into the painting.