In the process of my mapmaking, I've created a good number of custom icons in Inkscape. Usually, they show up in lower-definition on the maps to symbolize a political power. I assembled my favorites in a higher-definition image to be part of my art portfolio.
You should absolutely do that! You've got a good eye for proportions (I'd love to see the dragon in your personal icon blown up). Having my own personal library of icons in Inkscape is handy. Making them is a nice change-up from the bigger map projects, since I can make them quicker than a map.
I'm still quite the novice at Inkscape but I created the Dragon logo for the heraldic shield in my Ruins of Dragonport map with Inkscape and was pleased with how it turned out. I'll definitely have to explore making more