Welcome! As we've been getting quite a lot of models lately, and have been wanting to work on regions with unique rocks and ground textures, texture work is in pretty high demand right now, so if you're interested in helping there that would be great. That's not to say that concept art isn't needed, though; we could use that too.

As far as textures are concerned, there are three areas where we could sorely use textures:

First is the Thirr Valley region. The Thirr Valley region sits between the fertile Aanthirin region and the forested Othreleth Woods region, bound to the south by the red, arid canyons of Shipal-shin and to the east by the salt-soaked grasslands of the Deshaan plains. The region is relatively open, arid and rocky, except around its central waterways, where mushroom mangroves grow densely among orange lilypads. A rough reference for the colour palette:

This region mainly needs ground textures; while it will share many assets with the Aanthirin region, it should generally have a yellower colour palette and look drier. If you're interested, I can put together a list of the textures that are needed.

Next are the Deshaan Plains. A dry, hot, bone-white region, despite its husk-like appearance the Deshaan is a fertile plain and the Dres have made it Morrowind's breadbasket. That said, patrolled by skyrenders and cut by deep chasms, it is a perilous region to outsiders. Its palette works on a yellow/(very subtle) purple contrast. A start has been made at the ground textures, but the textures are rough around the edges and could do with improvment/fitting replacement.

Third is the Dres architecture set. Dres settlements come in three main varieties: the clansteads are massive citadels similar to (and developed from) Dunmer strongholds. They are made with a special light concrete the Dres create by force-feeding the honey-web spinning plainstriders porous rocks, dirt, crushed insect shells and whatever other materials come to hand. The mixture is excreted and then settled and shaped by slave labour. Having constructed the initial concrete base structure and dwellings, the clansteads are extended and embellished with organic structures of bugshell and saltstrap leaves. The same mixture of organic and inorganic construction can be found in the outlying plantations, whereas organic structures reign in the camps of semi-Nomadic Dres clan-warriors.
For the time being, just three textures are needed for the tileset: we already have a very good floor tile texture, but need better textures for the walls, buttresses and trim. The walls should be relatively light with a plain and even plaster, but possibly decorated with a tiling pattern of some sort. The buttresses would be very dark, with equally fine plaster, and plain. There are two possibilities for the trim: my original plan was for the trim to show the exposed concrete, which is lumpy and full of inclusions -- yellows, glowing cyans and so on. The alternative would be a very dark decorative pattern matching the buttresses. In general, the palette should be slate with a tinge of purple. The textures need to tile vertically and horizontally, except for the trim which only needs to tile horizontally.

The Dres tileset is also where we most need concepts. Currently, the large platforms that form the basis of the clanstead set are very plain, and could use some sprucing up. To a degree that could be done through texturing and perhaps more complex model work, but modular assets would also help a great deal. We already have a few assets, such as the graffiti in the alcoves and the lantern in this image, but will need more, including awnings and other structures in the style of the organic structures linked above. While alcoves, being inset in models, don't really work as modular assets, shelves/consoles sticking out of the structure could.

Aside from that, we could also use concepts of general Dres clutter and material culture, (as exampels, some rough sketches, mostly dried saltstrap with decorative stitchwork), and in the sense of more atmospheric concept art general scenes of life in Dres clansteads would greatly help in visualizing how we want the settlements to look and feel.

Anyway, those were a lot of words and a lot of options, but if anything in particular caught your interest just say so, and I can provide more specific information as desired, either here or on Discord.

That sounds good Cawdeen. As far as resolution is concerned, we have high and low resolution texture packs, so best case would be to have textures in a high resolution that can then be scaled down as needed. Some of the Dres landscape textures in the download I linked have a 1024x1024 resolution, which is probably a good size to aim for. That being said, a lot of our textures only come in the low resolution variant at the moment (256x256).

What exactly doesnt work?