Have you tried using a rpg mapping app? They usually work well and can export a picture/screenshot that you can post. And the players and critters are png files and therefore support transparency and nothing is "hidden" underneath them.
MapTool (
https://www.rptools.net/) is a free rpg mapper with a lot of punch and, sadly, a steep learning curve. Still a good choice.
Master's Toolkit (
https://arkenforge.com/) is an affordable (US$30) mapper still in development. However, it's quite easy to use... drop your map in and place your imported critter pictures (does not yet support tokens). Then it will be easy to move around the characters etc.