A brown-haired woman in a blue shirt decorated with gold trimmings paints a picture of two windows.
A woman is painting.
Answer: A woman paints a picture of two windows is the emphasis of both sentences.  The other words are excessive and unnecessary to describe the woman's actions.
A woman is painting a picture of two windows, therefore a woman is painting.
If the woman paints a picture, it could be said the woman is painting.