Thank you for your nice comments.
Possibly. All depends on the final render. Currently, my working PSD file is 570Mb, 300dpi, 7050 x 5550 pixels, RGB 16-bit, with each 1/4" square being 75 x 75 pixels. These JPG samples I have been generating are cut down to 60% quality and 50% the actual size. However, I think the final PNG map would be fine to use as a VTT battlemap (though printing out a full dpi physical floor map may be a little big - 94" x 74").
Step 6: Details - Round 2
In this step I have added an entrance ladder, cistern grate at the bottom of the large pool, and 3 shaded and glowing areas to represent the area of the three main traps.
Attachment 68976
Since this is a page map (something for the GM to look at quickly to say "hey, there's a room with a door"), not so much an encounter map (with room furnishings and deeper decorations), I think the major elements have been covered and the "drawing stages" of the map are done. One or two more steps and this one will be done!