Since I'm quite enjoying practicing digital painting, I felt like making it a little more interesting by doing a couple of studies based on one artist. Today, Rembrandt van Rijn. Tomorrow, I'm not sure, but since it is the weekend I'll have plenty of time to find an artist I like.
For the value sketch I took around 20 minutes to get sufficient amount of detail in. The color didn't take as long, so I guess about 30 minutes per sketch.