Portrait and landscape framing. Far far too many images I saw were in portrait framing. With surfers having wide screens it's wrong. Learn to pose models and shoot landscape. Poses with the girls standing over and over again are BAD. It means the image is auto shrunk to 1/2 or even 1/4 of the original size or having it so large the viewer needs to scroll up and down, which is terrible.
Again study the poses available. There are far more poses than just standing up. Kneeling, squatting, sitting on her heels, sitting on one leg with the other foot on the floor and the knee up, sitting open leg. And then all the laying poses and on all fours. Again no excuse for bad posing. Compile that posing book.
Focusing, exposure and depth of field. With so many images going larger and larger the clarity of the large image is essential. Focusing, exposure and depth of field need to be spot on. It's nice and artistic to get images in low light with candles or lights or a fire showing in the back ground. But it takes real skill to get it right on an image 1500x3000 pixels. Most of what I saw were out of focus at that size. If you're aiming at a soft diffused image use a diffuser lens or filter.