create a hyperrealistic 2D isometric game asset sheet of archer towers, multiple distinct fantasy styles (desert sandstone, dark gothic, elven nature with vines, dwarven stone with glowing runes, medieval European), each style shown in 5 clear upgrade levels (level 1 to level 5 progression), consistent scale and perspective, highly detailed textures, realistic lighting and shadows, game-ready, clean transparent background, no blur, no painterly style