It is missing the "backbone" (that you light with the firerod to expose the last entrance) and the closed entrance to the final section of the dungeon. If anyone happens to have them or a screen shot of it (with fog filter off) I'll add it to the set and credit you.
SNES version, or GBA? And how are you getting these, with emulator screenshots? In that case, I suggest two very good emulators with the necessary tool to eliminate such "layers": ZSNES for an SNES emulator, and Visual Boy Advance (VBA) for the GBA. It's relatively easy to eliminate layers, then take screenshots of what you're looking for.