Hello there, I have been spriting for a while, so here is my work.
This is my most recent work-
Lvl. 1- Zapegg- Spider Larva Pokemon- It can't walk, so it rolls around to move. Bug/Electric
Lvl. 16- Elantula- Electric Spider Pokemon- It's jaws are known to conduct large amounts of electricity. Bug/Electric
I'm not a big fan of bugs since I know practically nothing about them, but I'm sure that a spider larvae is smaller and rounder than the one you based your sprite on. Shading- and palette-wise, the yellow palette you're using ought to be toned down a little.
Lvl. 1- Munchipul- Bitten Apple Pokemon- They walk around gardens, stealing crops. Grass/Ghost
Dusk Stone- Munchitree- Apple Tree Pokemon- They serve as parents to Munchipul, and try to keep them from getting into mischief. Grass/Ghost
I like those two, but there are a few errors within them. They are both facing forward instead facing their right (our left) where the opponent is going to be situated. Tilting them and fixing the shading would do wonders to them.
Lvl. 1- Trilock- Key Pokemon- They aimlessly float around tombs and temples. Steel/Psychic
Lvl. 35- Keyriska- Key Pokemon- They guard tombs and temples by scaring away intruders. Steel/Psychic
In those two, you have to define the golden-yellow palette more. It's hard to make out their outline and the way the eye sticks out seems weird. Use UNKNOWN as references to shading and those will be perfect. ;)
Lvl. 1- Deepray- Deep Fish Pokemon- They sink to the bottom of the ocean because they aren't strong enough to swim upwards. Water/Dark
Level-Up Knowing Ancient Power- Crawlbite- Trilobite Pokemon- They crawl at the bottom of the sea and use sonar to track prey. Water/Dark
For those guys, their palettes need to be changed to a lighter one since I can't tell their details at all. Crawlbite needs to have his scales' outlines rounded and Deepray needs his light source defined better.
Lvl. 1- Sporslide- Mushroom Pokemon- They slide and hop on their mushroom that serves as a foot. Bug/Poison
Lvl. 18- Crawlspore- Mushroom Crab Pokemon- They slip on their rounded mushroom feet. Bug/Poison
Lvl. 32- Sporoll- Mushroom Shell Pokemon- Their mushroom shell is so hard that one could fall off a mountain with no harm.
Those are by far my most favorite pokemon of yours, but they need to be tweaked hard. You have to get rid of the geometric figures featured in their designs and you'll be fine. ^^