If you are looking for the most realistic resource pack available currently, then there is no better option than RTX Ray Tracing. As the name of the pack suggests, the RTX Ray Tracing Resource Pack offers highly dynamic lighting, reflective textures, and organic shadows. Your Minecraft world will never look more real than this. At least for now.
It also includes lots of shiny blocks that will make everything look super slick and modern.
Download the resource pack here.