Beautiful art but most of it simply can't be used for serious game dev. You can tell the design was first taught for a nice drawing then cut to tiles of 16:

• Many tiles are not patterns and can't be repeated (ex: some trees only work in lines of two, some pavements in lines of 4, etc.)
• 16x16 tiles are mixed with blocks of 32 (the water is 32, sidewalks are 16)
• Many directions and angles are missing (paths, roads, stairs, etc.)
• Mountains are not flexible and many perspective are missing
• Some tiles are duplicated in the tileset which makes it very confusing
• Some designs are inconsistent between older tiles and newer ones but taht's a minor issue