I mostly use memory palaces to memorize the law for long term. When I started, I made the mistake of underestimating the importance of spaced repetition. Now, I always make appointments in my calendar when I have to do reviews. This helps a lot with fading images.
I do 10 reviews in total:
- immediately
- after 24 hours
- 3 days later
- 7 days later
- 14 days later
- 1 month later
- 3 months later
- 6 months later
- 1 year later
- 2 years later
There are other approaches to spaced repetition, but the 10 reviews seem to work best for me.