I haven't updated for ages so here I go:
One thing I've learned is that everything is subject to change for the better so don't fall in love with your first draft. Compare V1 and V3 together and you can tell lots has changed. Not only the layout of the map but the map's functionality, size of areas, choke points and gameplay styles ect. Playtesting your map is important but, what is more important is how deal with feedback and incorporate it into your map. Constructive criticism is important for pointing out the flaws of your map that you otherwise would have failed to notice in the first place. Not all feedback though will benefit your map so take everything with a grain of salt. Great video for that Here.
When I finished with V2's revise I thought it was final and there was't anything I need too improve. After my 2nd playtest I soon realized there was way more to improve upon. The negative outweighed the positive by a lot. Nothing unsalvageable but tons of small issues of the map built up. That's why just looking at V3's layout is way easier to figure out the paths to sites then V2s layout. If your interested in seeing ether playtest I'll post it: -Playtest1 -Playtest2
biggest lesson learned don't ever create so much dead space in a map that it's literally "dead space". It's been coined the name No Man's Land during a playtest. I love the fact that it shrunk significantly in each version.
Here is some screenshots of progress.