The first rule in how to shape your eyebrows is: You can only work with what you have. On these eyebrows, she is fairly thin on the ends and has rather straight eyebrows. I want to shape them up a bit, but not give an extreme arch.
You'll have to do the same, and work with what you currently have. You can remove hair or use pencil to make them look fuller, but you can't instantly grow them. The following steps will help you decide what hair to keep or to remove.
Note: This guide is specifically for women, if you're looking for eyebrow shaping tips for men where different rules apply check out: How To Groom Men's Eyebrows.