Screenshots are actually better - Not everyone will open the editor and look at it to help you. The editor takes quite some time to load and eats up a lot of RAM, so some people dont want to or simply cant afford to open the editor anytime someone has a problem. Still, attaching a map is good in case someone already has the editor open and/or has the time to check it out :) But a screenshot will always help
In regards to your map, I think the Gold mineral areas don't really fit for a melee 1v1 map, there are way to many of them. I would recommend splitting new islands off from where the gold minerals are now and making those the gold mineral spots and changing the platforms as they are now to having 1 expansion worth of normal minerals.
The volcano in the middle of your map looks pretty cool but the rest of it is kinda bland. Check out my map and see how the lava flows across the terrain. The lava tile set has some good textures to make this effect while still having pathable terrain.
This is my volcano. I made this one quite a while ago. The golds in the middle can only be accessed by air and the path to the other start location is around the base of the mountain. Starting locations are at the SW and NE mineral locations and there are Watch Towers near the naturals that give you vision of your opponent's main.