I love Source Engine & Source Filmmaker (Same with Source 2). The apocalyptic art used in Half-Life 2, Counter-Strike Source, Day of Defeat Source and Portal has aged well (Portal 2 didn't have much of that). And even with an apocalyptic look, the Engine was used in Team Fortress 2 (Which is not apocalyptic but cartoonish/industrial), in addition to very good gameplay and better than GoldSrc (Engine from Half-Life1 & Counter-Strike 1.6) . Here are some of my artworks that I took from my favorite VALVe games. I hope you like it.
i believe that portal 2 age amazingly
Of course.