So you're only using a mouse? I remember those days. Good luck to you, that can be tough. That said, if you aren't already, you may want to work with references to help you with some of your forms, which come off a little blobby here and there. Working with a mouse can make this more of an issue but keeping a steady eye on the flow of your forms and how well they're established before moving on to high details, will vastly improve your work. Keep at it and don't get discouraged, you're well on your way.
I have a cintiq, but I use a mouse sometime to feel the struggle. It helps me to get different feels......I agree with the sculpt looks blobby, I try to spend no more than 15 min to 30 min on a speed sculpt.......I have just started to take z brush serious, and I planned on making a life style