First, find a scanner and scan your drawings. For those of you that thought it would be good idea to use your camera phone, hand held, to take a photo of your work, on your kitchen table under one light - probably fluorescent - or on your carpet in the living room next to your cat or your shoes...here is what needs to be asked....WHAT THE HELL WERE YOU THINKING?! Are you just trying to ruin your life, or worse, MINE? Why not go and slam the car door on your fingers? At the very least it would be faster and probably less painful to fix. Ahem. If, for some reason, you lost your mind for a moment and did intend take a photo of your drawing with your camera phone, at least lay it flat and get two lights of the same wattage and place them on either side of your work and find something to steady your hand so you at least simulate a camera stand.
Anyway, what's a good way to clean up all of the shadows and junk around your drawings if you do shoot them with your camera phone in manner mentioned above?
Let's start with the worst; a camera phone photo of a drawing as shot hand held on the kitchen table at 3:00 in the morning with just the kitchen light on. Result is below. Now, you could just turn this in because you are too busy to care, but your instructor is probably too busy to give you good grade if you force him/her to even look at this atrocity.
REVOLTING!! YELLOW!! COLOR!!
Because this is for a model sheet project and color isn't really a factor, first thing to do is get rid of the color.
Now, you know this, in PS (I even have used a really old version of CS5-gasp!) open your file and click Image -Grayscale and click Okay.
You will now have the below. Granted, it still looks terrible but at least that revolting yellow color is gone. Okay let's take away this gray.
Same with the legs as shown below.
The head/face and arm is really being a pain here so I select the whole group and go back to Unsharp Mask and after a little adjustment, I get it to a manageable value and sharpness.