[Karin Wells]

In the underpainting, you need to make the transitions from light to shadow very smoothly and with thick paint. This is not to say that the transitions can't be quick - just smooth. It is hard to tell exactly what I am seeing here, but the face looks "uneven" and appears to have choppy brushstrokes.

The background areas and clothing that have uneven brushstrokes don't matter at this stage if you don't ever intend them to be smooth. But when things have "texture" in the underpainting, you cannot compensate in the upper layers.

Texture belongs in the top layers...not in an underpainting.

As I see it, the major reason to underpaint is to resolve all the halftone transitions from light to shadow.

Here are the secrets to underpainting...easy to say, tough to do. When you completely understand that an underpainting is not meant to be a complete painting it is easier. If you really do the following things, you can critique yourself:

Highlights do NOT belong in an underpainting. (Add them in the top layers).

Dark accents within shadows do NOT belong in an underpainting. (Add them in the top layers).

Keep your shadows flat. This gives you the opportunity to mass your shadows together and will help with your composition. i.e., If you don't see the eye clearly because it is in shadow - don't put it in the underpainting.

Keep your light flat.

Do not add reflected light in an underpainting because it breaks up your flat shadow. Reflected light belongs in the upper layers.