Eggman is the perfect character to show off the ‘blobs’ drawing technique.
I find that the best way to give the characters more of a real feeling is to think of them as being made of blobs.
By drawing big round blobs I can work out their positions and get a sense of their place in space. It also helps to give them some weight so they don’t look like they are two dimensional or floating in the panel. Here’s a great example of drawing blobs.