For me a “good” photograph is a photograph I find personally interesting, curious and worth lingering over.
1. The sketch, draw, or trace test.
If a photograph is interesting enough for you to sketch or trace, it’s probably a good or interesting/unique photograph.
2. The joy of analyzing your photos after the fact
3. Photos of people that make your heart quicken
People in motion. Engaging shapes and movement:
5. Photos of yourself
I like looking at photo selfies of myself, especially with unique and interesting backgrounds: