This concept art by Lindsay Jorgensen is from an early stage of the game's production. It's so early, in fact, that it practically has nothing to do with Crash Landed as we know it. The dates on the files range from late 2008 to early 2009, which is a clear indicator that these are, in fact, Crash Landed concepts.
The first thing you'll probably notice about this picture is that Crash has a tail. Most of these pictures share that trait as a proposed redesign for the reboot. This is probably the earliest draft for Crash's design, judging from the more animalistic approach and lack of shoes not seen in the remaining pictures.
The rest is what you'd expect to see in a Crash Bandicoot game: a beachy area with hints of an ancient civilization, along with some sort of barrel-shaped contraption (possibly the chain cannon seen in one of the pictures below) and some fruits for good measure.
A storyboard showing a proposed feature where Crash would pick up several floaty mushrooms and throw them up in the air, in order to make his way across a chasm and out of some hungry hienas' reach. Crash's design is a little more human-esque in shape, and he's now wearing sneakers as usual. The front of the sneakers in this design is ripped, so Crash's toes just stick out. This was probably intended to make him look like a castaway.
Various ideas for some sort of manatee partner. Crash could ride it across the water, and it would feed on nearby vegetation. Crash's interaction with the local wildlife is a recurring theme in these pictures.
A goat with an elaborate cannon on its back, whose actual purpose is a mystery. You can spot a bandicoot running inside a hamster wheel, probably meant to generate enough force to fire the cannon.
Various sketches for a volcanic island. Notice the warning signs and fences to keep visitors out.
A grassy island with plenty of oddly-shaped trees. The file is named "IslandAldea01" ('aldea' is Spanish for 'village').
These are actually all part of a single picture. It was so big it had to be resized and split into 3 for your viewing convenience.
The picture shows a beach filled with animals that have fallen into various intricate man-made traps, each meant for a specific kind of animal. Even though this seems like the kind of thing Cortex would do, these traps are all very rustic, as opposed to a more technological approach you'd expect from the evil doc.
A ton of proposed designs for Wumpa fruits. They look rather distinct from the Wumpa fruits usually featured in the series, and the only thing confirming they aren't something else are the file names.
A stylized view of the game's explorable islands. You can see a gigantic machine underground suspiciously connected to each island from various devices, and it looks they're draining something into the core. This, of course, seems to reek of Cortex.
Some mushroom designs, likely intended as part of the scenery.
Heeeerrrre, fishy fishy fishy!
A couple of machines intended for Crash. One is a catapult, while the other one is a chain cannon that seems to use different kinds of capsules for ammunition. Note how Crash's design, though simplified in this sketch, is considerably closer to his final one in Crash Landed apart from the tail.
A bunch of parts for a tower used by Crash for unknown purposes. Crash's design is now practically identical to what they went with in Crash Landed, and he doesn't have a tail anymore.