Hi Lee, good start here, how long have you been at it?
Beginning with a "tonal rough" or imprimatura, is a very sound approach, a vast number of painters, past and present have used this method. Basically it serves as a nice guideline for the drawing (which can be as resolved as you want it to be) and often for values as well.
Scrubbing approximate local color on top of that is what the French academics referred to as the frottis (scrub-in), and is also a sound step, because it gives you a better context in which to assess the final color values of the painting, and in some cases it can show through in parts where it looks correct without overpainting. Working in solid color over a frottis can yield very beautiful effects.
The point of these steps is to dealt with particular problems of the painting before reaching the final surface stage, so you can proceed with greater authority. So if you've already tackled the drawing, values and approximate colors to some extent, it is easier to make the final decisions.
Also (this one's for you too Daniel) painting a portrait and a still life is, in its technical aspect at least, fundamentally the same process. You are still analyzing drawing (and planes), values, color, edges. In terms likeness, it doesn't matter if the painted head is 2 feet or 2 inches, the process is the same, you make it look like the person by finding the overall structure and relationships between the parts. Noses and eyes don't make the likeness, they're the frosting of the cake in a way, you can have them a little off and still have a great resemblance, because of the larger structure. Remember that you can recognize someone if they're 100 feet away or in a tiny yearbook picture, even if you cant see the features.
Regarding your work Lee, I would say scrap the ultramarine step, I've heard of some Spanish painters doing that, but it's showing up too much in your final paintings, and you can wash in shadows with the same burnt umber anyway.
I would recommend working more solidly on top of your washes, and try to work on longer paintings as well, at the moment some of the paintings look "washy" for lack of a better term, and lack the strength that you could get by using thicker paint. Try softening your edges as well, the majority of them are rather hard right now. Lastly, start working from life, if you bought that plein air kit, use it! It will provide much better training for judging color/value relationships than photographs.
Hope this helps,
-Ramon
PS.
http://www.artrenewal.org/articles/2...parkhurst1.asp
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