Welcome to PC. I used the same book to learn Zbrush; just keep working through it and you'll get better. My lion was pretty hideous, being my first sculpt and all.
Great work. You have created a very good base, that's the first step to a great model! The 1 thing I think people don't do in Zbrush, and this is a VERY vital step: Make sure you get all the detail you can from your current subdivision level. Don't hop up to the highest subdivision you can and start sculpting. Things get…