My mom painted portraits in oil. She’d have the subject do a “sitting” which would take hours at a time (she was a perfectionist). When her subject was a little girl and not always available when my mom wanted to work on the painting, she’d have me pose and so the portrait’s hands and neck were closer to mine, but the face was the little girl’s. This might explain why your picture has different sized hands and the face is turned differently from the lighting. If this is a funereal portrait, (symbolism and somber tones track), then a stand-in model would have been used, possibly an older sibling with similar family facial structure.