Image #1 Lesson in drawing poses: You cannot align a humanoid character's eye with its own butt crack. Try it, turn your spine, your neck, and your head, see if you can look down the middle of your butt. Your spine can twist from your pelvis to your neck a max of 80 degrees, while it is twisted to the max your chest is only able to twist 65 degrees. If you go too far you end up in the broken spine from the uncanny valley.
This is the same pose done reasonably: e-hentai.org/s/fa01036050/1806336-1
Just to make sure... you DO know, that I'm not the Artist, but just a horny winx obsessed girl sharing her porn collection and that your comment here propably won't ever reach the artist behind it, right?