Ten Exhibition Halls in the Art Hall, each filled with 4 artworks (from Artwork Fragment Chests), give 3 progress tiers requiring 20/60/200 items (280 total). Tier-3 rewards (all free once artworks collected): 1. Knight Equipment Hall (Art Hall Lv11+) -> 1K Gems x5, 500K Food x15, 24h Speed Up x15. 2. Oil Painting Hall (Lv13+) -> Research Stone x100, 100K Food x15, 12h Research x15. 3. Stringed Instrument Hall (Lv15+) -> 100 Stamina x5, 100K Lumber x20, 12h Research x20. 4. Jewelry Hall (Lv16+) -> Arrest Warrant x3, 100K Stone x15, 24h Speed Up x15. 5. Noble Crown Hall (Lv17+) -> Research Stone x60. 6. Ancient Coin Hall (Lv19+) -> 200 Gems x5. 7. Body Sculpture Hall (Lv21+) -> 500 Chips x5, 100K Gold x12, 12h Crafting x12. 8. Pot Hall (Lv23+) -> Research Stone x60, 12h Construction x10. 9. Cup Hall (Lv24+) -> 1K Gems x4, 200K Gold x20, 12h Speed Up x15. 10. Mask Hall (Lv25-30) -> Adv City Teleporter x5, 500K Gold x15, 500K Food x15. Activating Mona Lisa (Oil Painting + Jewelry + Ancient Coin halls) grants resource-gathering buffs. For a bot, filling these halls (via Artwork Fragment Chests from Hydra/Crazy Eggs) yields a large one-time payout of gems, stamina, speedups and gathering buffs.
Original research source: Evony Guide Wiki