The start of a good alla prima painting (done in one session) is a good, well planned, block-in. The study of art defines a block-in as: a sketch or outline done roughly and generally without detail. When painting landscapes, you may wish to sketch or outline more accurately while using only necessary detail. But you can have accuracy and detail and still remain loose and free. Particularly, in the beginning, brushstrokes can be open, natural, uninhibited and still be the right length, shape, and color. The way a painting is started determines the outcome of the art work. Because of this, the block-in becomes even more important.
If you attempt to paint a landscape in one session, then you must consider the amount of working time available, quality of light, and the complexity of the subject. Painting alla prima behooves you to master a good, quick and accurate method of creating your block-in. This takes practice and patience as you learn to handle this very important procedure.
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