I took a still of Luke with the magenta face and put it in “gimp” and put green in the shadows and it fixed the weird magenta you are getting so that should work.
Long shot yeah as I said look at “Star Wars begins” for that shot it looks like the whole shot was over dark I think the sky perhaps needs more gain or brightness and less saturation. Alternatively upscale that shot as it’s not blocky like the rest or color match.
3.It’s ok to have a washed out sky if that is the lighting conditions - dusty desert. Yeah it’s only at the start I can see the edge softness issue once he jumps off the landspeeder it’s gone.
4.Yeah it’s either blue contrast on that stairs element or it needs red push. The box the other side of the door also looks too sharp consider darkening that element a bit so it sits or blends better. This looks better than the star wars begins version just need to get the blend on.

To be honest it’s all small tweaks but you are very close to having that look very good.

I redid the Techdome Edit to improve it and added the Blue Milk Scene. Sww the link below

https://vimeo.com/manage/videos/654620410

There was some audio I discovered was the wrong way around when Luke Uses the Wrench

The important bit of audio was found in the documentary Star Wars the Magic and the Mystery where there is an isolated soundmix without Leia’s “Help me Obiwan-Kenobi” lines and with R2-D2 whirring and projector coming on. I think that tells us that we did not get perhaps all the changes that were planned perhaps as this fixes the fact the recording is not saying the lines at the time it is played by R2. A few scenes are shifted about.

I also employed the Tuskan Raider Rocking Backwards and Forwards trick on R2-D2 to help smooth out the continuity of the end conversation as it was a bit Jarring.

Then I added sound mix for Blue Milk to the end. Hope you like this final iteration.