Here they are!
and
I didn't make the thumbnail, though.
Umm, what is this? I think these will not be accepted.
These aren't ready to be submitted. Please post customs in the Spriting and Pixel Art board for criticism before submitting in future.
Moved.
You gotta put some curves in these. Piranha plant should be a circle but he's an octagon, and koopa's filled with straight lines
These piranha plants look a bit square. You need to round out (or otherwise triangulate) your shapes before you apply the colour and details. Good job on the Koopas' noses, though!