His results are bad, since he doesn’t respect the balance between in and out. His outdoors sky is darker than the indoors mid-tones. Bringing back highlights is fine, but inverting contrast and completely forgetting how indoors lighting connects to outdoors is unacceptable. Unless you are stuck in a dramatic storm, the sky is always brighter than anything else.
Marco Bucci has a very good set of videos about shading and values in painting, better start with that as a safety net before planning to be creative about lighting:
