"Self Portrait at 34" (shown actual size @ 3 3/4" x 3"), egg tempera on Kelmscott vellum
If you'd like to see the reference photo I took when I was 34, and worked from to create this traditional portrait miniature, I've posted it too over on Mona Conner Portraits.
After trying to paint my rhinestone necklace at miniature scale, I esteem even more the great work of Nicholas Hilliard (1547 ~1619) whose specialty in miniature portraits was elaborate jewelry and lace details. If you Google his name as an image search and scroll, you'll find many of his amazing portraits in miniature.