Hi! Thank you for the compliment. I am considering Dwarves (also Elves at some point), yes! As for Dwarven tile? I do have a Natural Interiors Tileset that has several cave types. As for structures, do you mean underground structures? (I do not have those yet, but that's an intriguing idea!)
Seeing all your tiles, you created enough things to start a world like a city, a forest, caves, but you can expand it to imaginary like orcs ( you did ) elves, dwarfs, dragons ( you did ) , vampires ( you did ), fairys, and with all you can do a tile also, like a dwarf city, a ruined city to undead creatures, high structures to elves, tiny structures to fairys.. and the universe will be growing much and much more. You also could create a farm tiles.. In my game I`ll desire create a map where will have a farm, I`l need to have a windmil, wheat camps, farmers.. just ideas..