tree looks nice, but for tiles you should try to make the tree outline the same size as the other side(symmetrical) because when making forests, ur gunna have to make a LOT of tree tiles to make it fit them all. (if that even made sense). same with the tree trunk. But the shading looks cool  |
Yeah, you're pretty wrong on that one. It wouldn't require much extra tiles at all, especially for a smaller tree like his. There's also the option of using tile layers which would just require the original tree tile itself with a transparent background. ;)