Most mushrooms that have rings are poisonous. This one, as seen on the beautiful sketch, has none and so will indeed be perfect for an omelet :) I love the deep yellow color with some blue accent on top :)
It looks as though it might be a boletus. Wonderful painting, but I agree with Teri. You have to know your mushrooms before you start eating them.
The mushroom is so cute, beautiful painting!
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