Hey there. Granted, im not an artist but im using a 16x16 base in my game, which means the smallest tile is 16x16 pixels. i now bought your osaka set that claims to be 32x32, just like the jrpg characters but the jrpg characters are basically made up of one tile width (+-) and 2 tiles heigth, which would mean that they are usable for 16x16 base games.
and the osaka set is fit to this so its basically 16x16, at least how i understand it. Take the flagpole for example. its 2 tiles high and 1 tile wide, just as the characters so they are 16x16. maybe you want to include in your description that they would be working for 16x16 as well