Hi there.
Looking at the two designs I have in the top 3 that are yours, I have had one of them ranked first the who time. I really like both designs, but have started to feel that they may feel a little "cold" for a dental office with the icy looking blues. I do like the touch of green in there, but could you tweak them to see what it would look like with a little deeper blue spectrum for the colors, and maybe show what that would look like with a green as week.
My issue right now with the mountain design is that it feels a little sharp, again for a dental office. More free flowing designs tend to work better so if you could "soften that image somehow, just to see if what I am talking about does anything, that would be great.
As far as your last question about what the "new image" may look like, I guess a concept similar to the one that I moved to the first ranking is sort of what I was after. That has a much warmer, happy feel, but still looks very professional and not overdone.
I think the two designs I ranked for you at the top are awesome, and they have been may favorite the whole time, just would like to see if you can adjust them slightly to see if that makes a difference to my eye.
Thanks again