You can also search the FOTD and tutorial area for #3 lashes and you may be able to find a pic of someone wearing them. I personally prefer #7 cuz I like the longer sweep at the outer edge,..
Additional thought: It really is easy to apply them once you have had someone show you how to do it one on one,.... Actually placing them on the correct spot on the lid took me a bit to master,.. but practice makes perfect. I bought a cheapie pair of Ardell lashes(#45) to practice with before I used my MAC.