>>48726480It's not great. Think about the plane she's standing on. If her sternum is close to the ground and her forearms are on the ground, her feet are far too forward. Her head is tilted up as well making it look creepy. Butt too round - at this bend the pelvic bone will take shape. Use the muscles and clothing folds to show contours as well.
It's a difficult pose and you do need to take some liberties with anatomy to get what you want, but this one is just not there yet. I did a jack-o-pose pic myself, and it was a challenge for sure. Honestly, I think your brother needs to study anatomy and perspective fundamentals more, and start with much easier poses. It is good to experiment so hopefully he's learned something. Also why isn't your brother the one posting?