She's definitely not too skinny. Even I look like that when laying down.
That said, I don't think the ribs poking out looks too attractive, so I think a different position would probably look better. It's not down to the figure of the model, though.
Many slim girls look like that when they lie down, I think its the way she is positioned that looks weird
That isn't skinny, she's just stretching :/
If anyone lies in front of a mirror like that they will noticed their rubs stick out and their tummy look a lot smaller than it really is. Like don't you find if you lie in your back your trousers feel really lose round the waist?
For girls, that is.
She looks fine!
Maybe a little too much ribcage etc but I think its more the angle the model is lying at rather than anything else.