Thank you, Caitlin. That was really helpful. I'm still not confident in poses/giving posing instructions. I think I need to find a sheet with a dozen or so good "standard" poses on and stick it to my tripod while I'm practising! Most of the poses were my friend self-posing, I didn't intervene too much - mostly because of my lack of knowledge/confidence so far.
I've recropped etc three of the images - hopefully these are improvements. Re: 4 - I don't like the pose much anyway, but my friend liked that picture (from seeing the fresh-from-camera version) so I worked with it.
I guess I was a bit naive to work with the black-shirt on black-background! I did put in a rim light, but it didn't really show up on the cloth.
4a.