Is she skinny?

I was looking at some pictures of Demi that I took yesterday, and a couple of them make her look really skinny, but others she looks fine. I am a worry wart, so I want other opinions! Am I over reacting, or no??
*She does need to be dewormed, but I am going out to get those today hopefully*

She looks nice and muscled in the first picture. The ones with the ribs showing a little bit may just be from the way she's standing. Rosie does the same thing. When you look at her when she's standing straight and from the front and back though, she looks like a 55 gallon barrell.

This is just my opinion though.