Ok so I have been working on adding graphics to guitar bodies, I learned most of what to do on a you tube vid I found. I have gotten pretty decent at it, one thing I noticed in his vid is that the lighting on the original guitar was coming through to give a more realistic look. I have used the opacity like he did but depending on the color of the original guitar and the graphic I am laying over it if I reduce it too much it takes away from the realisticness and if I don't reduce it enough it looks fake. Also I have seen about displacement to have the image contour the body and also I seem to run across multipying in blending mode. The other thing is the way I do it is I duplicate the layer and then erase the parts of the top layer to expose the parts of the guitar I want to show through, such as the knobs pickups etc.... I have gotten pretty good at those the part that is hard is the strings because they are so thin. I just zoom all the way in and pick a brush size the match the string and then follow the string but it is hard to follow it perfectly and is time consuming. I was wondering if you can make a custom shape for the eraser to fit the pickups and do it in one click instead of having to do it with the regular eraser.I am just trying to find a way to be more efficient and speed the process up. Also add more realisticness to it. I have had someone approach me about doing this for clients before to see if they like the design. He is a custom builder. Here is one I am doing for myself that a friend is going to paint my Ibanez to match.