Which oil painting style fits modern interiors best? A professional psychological and interior design research based on PAD emotional state model and EEG tests has given a clear answer. The study covering mainstream interior styles confirms that Impressionist and Post-Impressionist oil paintings rank first in interior compatibility, with a 82% positive preference rate among homeowners and designers.Different from abstract and contemporary art which may trigger negative visual emotions in plain modern spaces, Impressionist works with soft brushstrokes and layered light and shadow can effectively soften rigid modern furniture lines. Test data shows that hanging Impressionist oil paintings in modern living rooms and bedrooms improves indoor visual comfort by 75%, making cold minimalist spaces warm and vivid without disrupting the overall style.