First picture looks good, how the heck is Alyx so big?
Fourth picture, Scout looks more like he fell on the Engineer
Fifth picture shouldn't have Simple DOF, the whole image is slightly distorted, looks good otherwise
Also...
SOMETHING I'D LIKE TO TELL THOSE WHO USE THE TF2 SHOTGUNThe TF2 shotgun uses the same material as the Half Life 2 shotgun, to remedy this, press the ~ key to open the console and type this in

And press enter
Then go to your Materials tool and use it on the Shotgun