Oh, I love this question, thank you!!
To be honest, I'm starting to get to a place where I'm pretty fond of my own art! I have it up all over my walls at home.
But the piece I feel really proud of is my acrylic Damiark painting:
For me, this is the culmination of some very real traditional painting skills I ended up building just from trying to occupy my time and hands with something.
When I was younger, I really wanted to do graphic novels, and focused on graphite drawing. I didn't really see myself becoming a painter... I never would have thought I could be one. I never really worked with color, at all, period.
Now, I think, working with color is deeply fulfilling to me.
This painting required me to do a perspective sketch, be able to successfully mix my own colors over and over again throughout multiple days and weeks, convey different textures and weights of multiple kinds of fabric, and play with color/character theory for visually differentiating characters based on their undertones.
This was really the first piece of art where I had to recognize how much effort I put in and how much I accomplished in what I set out to do.
Like, not to understate it, but this piece made me realize I'm at a new stage/level with my art than I've been in before.
Compared to traditional art I painted three years ago, this is a huge feat... not just artistically, but also in my mental health journey.