Custom icons don’t scale properly on map

Like your plugin and it fits perfectly for my purposes.

The only issue is the fact custom image on markers don’t scale properly. It’s either too small or huge.

Tried several img sizes fm 50x50px to 500x500px and can’t find one that works with that map, as you can see here

I’m trying to reproduce this map I prepared on google earth, with custom markers.

Any guidance is appreciated.