Here's a concept for a potential creature for Morrowind. There is a legal document in Arille's Tradehouse that mentions 'Ash-Fowl,' and claims that serving them is prohibited under Imperial law, but there seems to be no other reference to it in the games. (https://www.imperial-library.info/content/tradehouse-notice)

Birds don't strike me as very Morrowindy, so I gave it more reptilian and insectoid features to make it sufficiently weird. It is likely unrelated to birds and is a case of convergent evolution, being more closely related to guars or nix-hounds. Ash-fowl is probably the Imperial name due to its similar appearence to the fowl found in western regions. The Dunmer will have their own name for it.
 

Thank you so much Ateiggaer! I'm hoping to work as a concept artist in the future so feedback really means a lot! I hope some of my drawings will be helpful for this project.

Here are a few sketches of Khajiit breeds based on their descriptions in a really interesting post by Kevaar. I feel like its kind of odd that we only see one breed of Khajiit in Morrowind, and I think it would be awesome to have maybe a few Cathay, Ohmes or Ohmes-Raht in more Imperialised multicultural areas like Old Ebonheart, since we see these breeds in other games. Ohmes in particular are stated to be widespread throughout the empire as their human appearence makes them more readily accepted by the other races.

I really don't know anything about modding so I'm not sure if that would be possible to implement, but if we could I reckon it would really help make Morrowind feel like part of a wider world.

Here are a few plant concepts for the Deshaan and Arnesian Jungle regions.

1. A hardy shrub that grows in the Deshaan Plain
2. Small primitive plants that grow in groups around salt lakes in the Deshaan Plain. They consist of a single stalk and a bulb where they store water and nutrients
3. A bulbous flowering plant from the Deshaan Plain. It stores large quantities of water in its trunk
4. A red grass from the Deshaan Plain. It's leaves form spherical bulbs to minimise water loss
5. Primitive reeds common in the marshes and waterways throughout southeast Morrowind
6. A bulbous root that grows in the Arnesian Jungle. It has no leaves and instead absorbs nutrients from plants that grow on top of it
7. A carnivorous plant from the Arnesian Jungle. It has a symbiotic relationship with a native dragonfly; the plant holds a pool of water where the insect raises its nymphs, safe from the predators in the Jungle's rivers. By altering the acidity of its pool, the plant kills and digests some of the nymphs, while allowing the others to grow