what picture do you have in your mind of edward hydes appearance?

I see a short stunted and slightly deformed man. He would have a greenish tinge (remnant of the potion!) and rotted teeth (personal hygiene was not on his things to do list). I think monsters are far more scary when you leave the finer details out. This lets each person imagine what is scariest to them to fill in the image Stevenson knew this and purposely left out details of Hyde's appearance.