Thanks a lot for your amazing comment my friend. Yes unfortunately the tech is not developed yet for us to have wonderful resolutions with small sizes. Webp format doesn't work due to high res and Jpeg is the smallest format I could find losing little bit of quality. Png format is 3 times bigger but the quality difference doesn't worth.
About the tile sizes, it varies in every VTT program but you can calculate roughly mid size maps should be 50x50 and large ones 75x75. Very rarely I make crazy 100x100 maps as well. You can understand which one is which from their file size honestly. When this doesn't help, I'm trying to make 1 tile the size of a "chair" in the map and it mostly works :)
And finally you're right, I'm receiving some good deal of Nuclear Winter map requests but the thing is I don't have winter assets :( once I'm able to find some I'll immediately start making them.
A bit of hype, next pack will present abandoned battleships which some of them might even be functional!
Thanks again buddy, I really appreciated your words!