Here is a full graphics overhaul for the game Castlevania which has more detailed graphics.
Castlevania (USA).nes - NOINTRO
CRC32: 39C879BB
MD5: 00D93C9F6B8AEFB8B6C02B20147DF4EC
SHA-1: A31B8BD5B370A9103343C866F3C2B2998E889341
SHA-256: 55BCAB0D9EFC33A9D9EFC90F2C3C4AB12F3221A44B1F357E6C6202A456399AA8