Oh god, at first glance I almost had a heart-attack until I read this part 'here are some concepts'
Nevertheless, some really nice concepts. And the first one there looks like something I'd deffo want to do had I been on the project/had enough spare time
The lighting in the first one looks a bit fuzzy though, yet still gets the point across. If you have some time and want to put the things on the portfolio however, I'd prolly try to tweak it a lil' bit more, just to make sure it isn't as washed out.