Tom,
You have picked a wonderful challenge. The Getty Museum in Los Angeles is one of the most outstanding architectural treasures in California.
One could write an essay each on just the doors, the stairs, the stone or the garden.
The choices you have made for images are interesting and show the potential. I'm not sure that the web allows the full greyscale of your first image to be represented. However, I can see that as a magnificent print. I would go for a broader tonal range with a lighter sky. Also I might favor stitching two or three adjacent images to give more context and setting for the architecture. Still this is a matter of taste, but I do feel that there is more to see laterally and below to maximize the viewer experience.
It is likely that you already have the required images to try other versions. There is IMHO, a lot of room for experimentation here.
The second view of the overhang to the side of the Getty is one I have taken in full sun. I must admit that I didn't think of trying it at sunset. Conveniently, sunset does come in fairly early in L.A. Here is another challenge to make the overhang contrast perfectly against the sky, (as you have pretty well cinched) and also showing the scene below.
I would suggest experimenting with developing an extra copy of the RAW for the shadows and combining the two.
The last image, is, I think more difficult as the compositon is complex.
I commend you for your excercises.
BTW, I think Rainer in Architecture might be helpful.
Perhaps this thread should be in that section?
In any case, if you like, I'd be happy to have an L.A. trip to the Getty to photograph there.
Anyone else interested?
Asher