Here's a portrait of a friend I did, for his birthday:
Portraiture is one of my favorite things to do. The only problem with birthday portraits is that I like them to be a surprise, which rules out asking for good reference. I usually get a picture through Facebook, which can be a little hit or miss. On the other hand, it can lead to interesting poses and lighting I wouldn't have thought of on my own, and working from lower resolution reference is good practice.
One thing I really need to work on is a better way to finish these. I sprayfix them and mount on black matte board, but the mounting is the problem. So far I've gotten best results just taping up the borders with black tape, but I still think that's a bit tacky. This one I affixed with acrylic matt medium, which I've only used a handful of times before, and it ended up not affixing flush, so there's some ridges where airbubbles were present. Thankfully it's not super noticeable, but still, pretty annoying.