Hi Jenafur,
I would probably ask his teacher what she thinks. My DS was never a big draw-er, didn't care much for crayons, pens, pencils, markers etc. And his pictures still aren't very good; although he could draw amazingly elaborate mazes from about 4 years old. Mazes are the only thing he ever *wanted* to draw.
No one ever said he was behind; although his kindergarten teacher did spend time making sure he was up to speed on scissors. Anyway, I guess I'd reassure you that it probably is OK if it doesn't interest him yet, but I'd still have you check with his teacher
