Dry point is one of my favorite printmaking techniques. I work on aluminum a lot myself when I am doing small editions for the very reason you stated, it is so much cheaper.
I like the portrait you have done here. It is an unsusal pose, and that gives it a lot of interest. Plate tone is something that can enhance a piece, and I tell everyone that they shouldn't try to clean off every spec of ink that isn't in the etched area. Thanks for sharing this piece. I hope you had a great time at the workshop.
Ah, make the most of what we yet may spend, before we too into the dust descend.... Omar Khayyam
Stone Chief Studio