That's kind annoying when you throw grenade and it stuck in shelf.
IMG [s27.postimg.org]

I think there IMG [s8.postimg.org] could be wall, so you can bounce flashbangs.

I my opinion this areas IMG [s27.postimg.org]
looking to grey(window and door) it's almost look like black and white effect.

And A plant is missing some collors in my opinion, like this grey bricks wall IMG [s23.postimg.org]