A couple odd things that you may want to address:
Lighting in hallway (for lack of more descriptive term) is short on logical sources. Given the feel of the map, probably inset texturing?
Map is within floating box- probably want to extend edges of box to edge of map.
Texturing is a bit drab, it'd make the map much more interesting if you mixed things up a bit.
Along same note as above, there are few distinguishing features or details. The only real details are the very burny torches. Add some boxes, some rubble on the floor, some designs in the wall and ceiling. Given the simplicity and compactness of your map, you have a big budget for details. Make the accent at the edge of the walls actually inset or outset a bit, to make them more visible and defined.
A cfg defining some misc stuff like fogcolour etc would not go amiss.
Mapmsg can use spaces, so long as you put it in quotes (ie, use /mapmsg "Grim Retreat by Yeti" to have that output). It looks much more professional.
Publishing notes:
Be sure to make jpeg extension into .jpg, not .JPG. Case matters!
Please put your map in packages/base/, rather than the root of the zip.
It's not a bad map, it just could use some polishing and detail work. Possibly one more room too, but that depends on your design philosophy.
