@roman, they are 5000kelvin LED bulbs which produce white light at 1750 lumens. I use 6 of them at eight feet high. I set them 1 to 3 feet behind me when I paint. The black drape kills light reflections and glare. I do not try to paint in daylight because the light changes too much. My setup gives me predictable illumination which has allowed me to develop my color mixing skills more rapidly. I have also learned that sometimes I need a separate light for my palette.
Since I cannot decide how to proceed I am resorting to experimentation. This is scrap canvas taped to scrap plywood and stained with Geneva stain just like the subject painting. Next I added some grey scales so that I can try three different techniques for the application of dead layers, verdaccio, some combination thereof and glazes. This is all done with liquin so it will dry fast. The subject is still a little wet and must be dry to the touch before proceeding.
"if the light should be at a 30 degree angle above and behind the painting" Probably typos but just to clarify, 35 degrees and behind the painter. Mark stressed, and Emily reiterated, that glare comes from behind you. You can have a bright room if you hang a black, non-reflective sheet behind you to block light directed at the canvas from directly behind you. Any oblique angle will throw the glare away from you.
I have my light on a mobile platform at 8 ft in a 10 foot room. 35 degrees is optimal but if you are working on a part of the painting where there is no glare then it does not matter what the angle is. if you are working high in the air it may not be possble to get a perfect angle
Thanks Paul, I will work on that tomorrow. I am trying to be very careful to model this correctly. I have a black and white photo I am matching to. When I was matching to the color photo, I was doing ok, but it needed to be lighter, so I photoshopped the exposure and purposely lightened it up about 10% and started over. Thanks Alsart. I gotta tell ya, its been a blast. I have never painted in monochrome and I have really enjoyed it. The depth seems deeper and easier to achieve. It really does reduce the stress level when the color is removed.
I think you have done so well for your second try that you have nothing to complain about. I think the colors of the flowers are very close. The greens are splendid. You do need to practice your lines and edges (me too!). You are allowed some artistic license and this time it worked for you. Congratulations.