Tartan's comments are correct but why are you concerned about the back? Unless you are putting this into competition, I wouldn't worry about that. To me, hand quilting has its own "signature". It doesn't have to look like everyone else's. Personally, I go for consistent stitches on the top and my style is more of a running stitch. While I somewhat try to go straight up and down, I push the quilt up and down in front of the needle. Sure hard on my fingernails but the work is satisfactory to me and that's my goal. I usually use a fabric with design for back and that hides any 'imperfections' there. Wall hangings have plain fabric backs but nobody sees that anyhow. Enjoy the process and you will find with practice and time, as with all things, you will see improvement in your work