you should add in re-size it to 2560x2048 while adding decals so they wont stretch.
also i wouldnt remove all of the layers, i would just leave it as take it panel by panel, just paint it and add layers as you go.
also you should take the blank skin at the botom, and move it up right below the black mask, and set the layer atributes to multiply so the shadows are there
~fml