I like the simplicity of #7. Would like it to be a little more colorful. Would like the symbol to be more identifiable - to be less abstract and more of a human figure.
#6 we do not like it to be a color background. Also, do not like the military shade of green.
#19 - i liked it better when it was just the circle like in #7. Is the circle supposed to be a body? Can you make the circle look more like a human figure doing that yoga pose? For reference, the pose that I think the circle represents is : http://www.yogajournal.com/poses/875
#18 - wrong colors. Do not like symbol because it does not represent yoga.