Early on in my dovetail research I came across a reddit user who posted a log of his dovetail practice joints. Apparently it took him 38 tries to become proficient in the skill.
I liked the idea so I’ve been taking pictures of all of my work. I definitely need more practice, but I hope it won’t take me 38 tries.
Dovetail #1

I’m not sure if this one counts as a practice joint, but I did learn a valuable lesson; be sure to mark what is waste and needs to be cut out, and what should be left alone.