ok except the huge hand problem, her pussy kinda looks huge too compared to size of her knee and legs which im sure are closer to camera/angle of view, i mean that pussy is even bigger than her whole knee xD! unless she is pushing her pussy into camera/angle of view OR she had too much sex with horse dick xD
But except this size calculation problems, i love the posses and the idea behind it!
EDIT: one interesting thing is that her pussy's size and hand's size are correct compared to each other! but not the rest of body when we consider the angle and depth of view