CosmoRomanticist, please don't swear.
More to the point...you could always draw fauna which don't need good coloring skills to properly draw.
Try using the Phantom Filtersquid, Deep Crimson Phantomsquid, or Red Phantomsquid (once the digestive system flip is figured out). They're all mono-colored.
If you can find some organisms that are actually pure monochrome or pencil colors, it should be a lot easier for you to submit things. For example, Puroisters are dark grey with grey fan-arms, and the art for the Bloister seems to be just a very good uncolored pencil drawing.
If you can find some organisms that are multiple shades of the same color, or are mostly one color with accents of another, it also expands what you can do. My Acucravat drawing, for example, is mostly dark pencil shading, with a few color accents.
The Camouflage Foi and Dixon Foi are transparent and nearly colorless, too.
You could also simply make mono-colored or transparent descendants of colorful organisms.
Most of Solpimr's art has very simple coloring, so you could simply filter "Solpimr" and "extant" to find some good candidates for color practice.