the way you captured the sun is excellent. i think the exposure is perfect. can you please remeber that setting.
the night photography i think is not that effective for the following reasons:
- the trunk of the tree is not the most interesting subject there, yet it seems its the main focus,
- too grainy. i think you use Post processing software and you pushed the mid value too much whils you lost a lot of details
the third image is much better in composition and exposure. the use of lines and perspective is very effective
the last one's exposure is still a bit dark, but the intention for capturing shadow has been nicely delivered.