The lighting is challenging here because you're capturing mostly the deep shadow-side of the lizard. I think overall #3 has the little guy (or maybe it's a little gal) happens to catch the best lighting.
#3 happens to have a rule-of-thirds composition, but so does #2... but #2 (ignoring the lighting) has him facing out of the frame. When subjects look away or out of the frame it creates "tension" in the image. Usually tension is a bad thing in photography (but there will always be those exceptions.)