The last couple are fun, but they look a little too much like the statue of liberty. Also, it would be nice to incorporate our name "Walla Walla Orthodontics" directly into the "WOW" like in the sample image I provided.
I'm impressed with your creativity. Each of your logos has been very bold and very fun. They each miss the mark in one way or another. Either too busy (#20-24) or a little too harsh with straight projecting lines at the ends of the "W's" (#11-17). I like the simplicity and fun of #18, but I feel it is a little too plain. I also prefer a light blue, grey or silver as the accent color as opposed to green. I would love it if you could submit a new concept. I feel you can top the logo I currently have ranked at #1.