Why do roughs look better than finished artwork?

Here are 2 characters I am working on at the moment for a publisher. Fingers crossed they will love them and ask me to illustrate their books.

These guys are pretty much me and my Grandad in the old days when everything was fun and I was still small. Although at 5'2" I don't think I've grown that much!

My Grandad was an amazing artist and I think of him everytime I draw.

I think he accidentally threw me in a river once. He definitely covered me in ketchup (by accident) and he could build anything at all with a few boxes, sheets of cardboard and a roll of masking tape. Genius!