You are right, I should write some legend:
Waist: #1 & #2 = original, #3 = a bit relaxed, #4 = realistic
Hips: #1 = narrower, #2 & #3 & #4 = a bit wider
/what is right English word for body surface part where pus*y and pubes are?/: #1 = smaller, #2 & #3 & #4 = a bit larger
Pubes: #1 = smaller brownish, #2 = larger brownish, #3 larger grayish, #4 smaller greyish
Slit: #1 narrower pink with hair, #2 = wider pink with hair, #3 shadow of slit with hair #4 longer shadow of slit without hair
You can vote for any combination of parts above, not necessary for one of four on the picture. You can also suggest something that's not there yet.