Here he is our character in ten easy steps. The final step is to "finish" it.
The first thing I did was add feet. I almost always just use the curve tool for feet. All I need to know is what angle I am viewing them from. Then a simple single curve is all it takes.
Attention to detail. Small little details are un-noticed to the conscious mind. But, the sub-conscious mind will pick them out even before you consciously know what your looking at. If the little details are wrong, or missing, your viewer won't like what he is looking at, even if he doesn't know why.
So, I fixed a few details(around the mouth, arm too slim, etc). I also added a pocket to the lab coat. It even has an ink pen.
Our little mad scientist is fine. He just needs a world to live in.