My primary suggestion at this point would be in regards to your grid. Perhaps less subdivisions (1 every 4 or 5 feet, rather than what looks like about one every 16 inches ). As it is, a lot of your detail seems obscured - perhaps reducing the contrast on the lines? What kind of software are you using?
Other than that, not a bad start. (I'm not much of a dungeon mapper, so most comments I have would relate just to aesthetics, I'll let the pro's take over from here, lol)
Question about the one on the left, does the orange represent flames/lava, or would that be glowing hot rock?
(On closer inspection, the second has a decent grid, it's mostly the first one that would concern me in that respect)