[Karin Wells]

There is a large range of "acceptable" in underpainting...and what I see falls into the "acceptable" category.

However (and this is merely my subjective opinion), I think that your darks are much too dark. When you add color glazes to these dark areas, they will get even darker.

Beginning with such dark areas risks losing that "translucent and thin" quality that are so delicious in a finished piece.

Your light areas are perfect in the value that I see and with the addition of thin color glazes this will allow you to build up thick light.

Generally in an underpainting, I like to see a much more narrow range of values...ultimately it will give you more latitude.

So that you can see what I mean by a more narrow range of values, I am attaching an underpainting study that I did a long time ago. It is a detail of Mme. Ingres (I never bothered with the glaze stage.)