OK, I am not saying these items to be offensive, but here were my instant impressions upon seeing:
1) model looks marginally too young to be posing nude.
2) model looks scared - is the photographer making her uncomfortably nervous?
Then, I went into your gallery and could basically dismiss those two concerns, but that is what popped into my head first. Although, it still looks to me like the second point is at least partly valid.
You're a pretty and brave model. Hopefully you'll find good photographers to work with to make art. Stick with a few and work to elevate your portfolio with them. Best of luck to you!