Dive Deep into Creativity: Discover, Share, Inspire
Never let your shadows be black. The shadow's color will always match the background's one. It can be halftone brighter or darker - depends on the lighting you have on the scene, but never goes completely black.
Preserve the colors at any cost. No matter how many additional layers you have above, the original colors must be preserved even after all manipulations.
3. Convert your raster images into smart objects. Resizing such things in default mode = quality loss. Luckily for us, this problem was foreshadowed a long time ago. Convert your non-vector images to smart objects before doing the resizing / warping / perspective transform and enjoy the flawless result!