I need to play timezone sometime...
AGI
1. Manhunter 2. I really like LSL's backgrounds, but from what I've seen, Manhunter 2 almost looks on the level of the early SCI games.
2. Gold Rush! The world was really immersive: it felt like you were in the era. I particularly love how the buildings were drawn.
SCI
1. King's Quest 1. Everything from the grass to the trees feels more detailed than in KQ4. Even though KQ4 had better locations, I feel that the KQ1 remake got much more out of each screen than KQ4 did.
2. The Colonel's Bequest. A tough choice, but this beats SQ3 due to it probably being one of the most atmospheric games on this list. Also, it seems like everyone's posting outdoor pics for this game, so I'll do an indoor one.
VGA
1. King's Quest 5. Basically for what I said before, for the huge variety in locations.
2. Ecoquest 1. A really tough one, and I haven't even played Ecoquest. SQ4's backgrounds are great, and convey the dystopian SQ12 really well. The humorous throwback to SQ1 was a great addition to the art as well. However, Ecoquest's screens, from what I've seen, are nothing short of beautiful.
3. Gabriel Knight 1. I haven't played either yet, but I like what I've seen of GK's more.
4. King's Quest 6. QfG3 had great art, but KQ6, like KQ5, wins for many different locations.
Cartoon SVGA
Leisure suit Larry 7. The backgrounds in that game felt way more vibrant and jam-packed than what I've seen in KQ7.
Realistic SVGA
1. Can't really judge the games that I know nothing about.
2. Finally one where I have a good idea of the 2 games involved! It's also a tough one, because they are so different in art style. I'm going to go with Quest for Glory 5, though, because the art was 'created' rather than photographed.