I think you cant enter that area untill you have the hammer/that axe you get from the crypt.

Try diving through waterwalls.

The huge crystal found in the first righthanded room from the entrence can be bombed that opens up a new route.

Nope you need the candle to burn the bushs in front of the gallery its just one screen down from where you errors mansion where you got the bow.

I hope that helps.