I really like how you have done this. I like how Ash is giving support, while Kaidan is stepping up as protector. It seems very fitting to their characters and roles. I also like how they are each portrayed (in physically terms). Overall, great job.
lol I thought some people might notice that (not that I posed their heads like that on purpose xD) Seriously I didn't,It was after I fully rendered this that I saw the posing really and I thought "well...if some people have their minds in the gutter,it isn't my fault"