Here's a portrait that I'm currently working on...
I've been using M. Graham's Walnut Alkyd Medium through out this painting and really enjoy it. It feels like straight linseed oil under the brush.
During use Graham's W.A.M. is a very slick and flowing medium. It sets up almost as fast Natural Pigment's Balsam Essential Oil medium. This due to a lack of a balsam component in the medium. It dries with a fare amount of gloss but not quite as much as a Balsam based medium. I'd call the finish "Semi-Gloss". When I paint with this particular alkyd medium I've been adding about 1 part spike oil to 6 parts Graham's. My thinking is this small amount of solvent will help to facilitate fusion with previous layers as Graham's W.A.M contains no solvent on it's own.
I plan to explore a few of the alkyd mediums on the market. On the next piece i work on I'm going to give Galkyd for Gamblin a try.