What everyone's saying is right, you've been using brush tools and turned this from pixel art into a mixture of pixel art and a digital painting. It looks really nice (In fact, that might have been how Battle for Wesnoth did their background assets), but you could have easily done the same in pixel art if you applied some careful anti-aliasing and color selection.
Reduce color count on your tiles and assets to around 16 colors, and you should have a good balance of smooth colors and the awesome contrast and sharpness that pixel art is capable of. ;D
Reduce color count on your tiles and assets to around 16 colors, and you should have a good balance of smooth colors and the awesome contrast and sharpness that pixel art is capable of. ;D