I have had mediocre results when it comes to people coloring my artwork. The problem usually occurs because the person coloring does not understand how shadows fall- specifically the planes of objects.
For example, here is the construction of facial planes, as drawn by Andrew Loomis:
Shadows fall on the face in accordance with these planes. It changes depending on the light source. Here's a nice photo I found on the subject on photobucket:
Below is the colors that were done over my artwork for Kong: King Of Skull Island.
As you can see, in addition to muddy colors, the shadows on the faces are all over the place. There is no rhyme or reason to any of them.
Here's another example from Len Strazewski's Milos.
I didn't want to color the pages myself, so I chose to get someone else to do it. Here are the results:
After I saw this, I knew I had no choice but to color it myself. Here are the final colors:
Though important, this is but a small issue when it comes to coloring, especially digital coloring. I will be explaining more in a future post.