Just adding my experience...
DD7 hated drawing when she was little. She wouldn't even color! It held no interest to her. When she started pre-K her drawings would come home with a single crayon mark through them. It was crazy to me. But it wasn't her thing. She also had horrible penmanship and we really struggled with it in 1st grade. She could think faster than she could write and didnt care how her penmanship looked, she just wanted to get the idea out. Now she's in 2nd grade and its like a light went on. Her "art" abilities have increased 10-fold and her penmanship is very neat (thanks to a great 2nd grade teacher!)
I certainly would not consider it a sign of poor motor skills, rather it may just be he doesn't like to draw or write!
GL with it!!
