"Utopia" by Russia-based shtopor777 of DeviantArt, modeled in Source Filmmaker and enhanced in Photoshop. Quite powerful. You can find more of the artist's work here.
The Scout tries to break through the fourth wall in redditor Karhunperse's Source Filmmaker photoshop, aptly named "4th Wall." It might also be a reference to the thematically similar Saxxy Award-winning short, Animation vs. Animator, mentioned by Karhunperse in the post's comments. Full pic below.
A hardboiled fortress: check out this cool noir scene featuring TF2 characters, made in Source Filmmaker by MrRiar. Pretty badass, right?