- HDR
- Depth of Field
- Dynamic shadows (granted this feature is probably implemented but not too visible due to Overcast weather)
- Soft particles (for the waterfalls)
- Radiosity
- Ambient Occlusion
- Larger view distance
- Post-processing filters: Color grading, filmgrain
- Tesselation (most noticeable around mountain edges)
This is how it could resemble. Remember it's not official and it's more of a wishlist:
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Edit: Some people think I went overboard with the shaders, so here's jonwd7's much subtler (and well done) version:
"@OP
I think you went a little overboard...
Here's my attempt:
http://i1022.photobucket.com/albums/af346/jonwd7/Skyrim/Markarth01_EDIT.jpg?t=1295366513
vs Original: http://static.zenimax.com/bethblog/upload/2011/01/Markarth021.jpg
(Toggle between tabs if you can) "