Woah, I seriously like how the ass has been drawn. :>
Even the shading is nice, In this drawing the only major flaw I see is the middle finger on her rigth hand that is a little weird.
But beside that it's a really good looking drawing!
the overall look is good the shading , the folds, the eyes, are all good.
just the foot and the bed seems a little messed up.
Eyeeaaa
Haven't seen any major flaw.
You're improving!
Also avoid taking pics with your phone...
First time practicing shading
One of my first good pictures
First multiple person picture