It's not about art style that defines whether a series deserve to be called 'anime', but rather it's place of origin. If anything, Japanese artists and mangakas are constantly encouraged to explore and experiment with other styles of drawing. As a result, there is no longer a 'standard' or 'template' that an anime's appearance is based on.
Now, you can all argue logistics, and how the Japanese consider all animation, regardless of origin, to be 'anime'. However, from a general point of view, and in normal anime terms, 'anime' is a French word that is used by the Japanese when referring to animation that comes from, and is conceived in, Japan.
Now, you can all argue logistics, and how the Japanese consider all animation, regardless of origin, to be 'anime'. However, from a general point of view, and in normal anime terms, 'anime' is a French word that is used by the Japanese when referring to animation that comes from, and is conceived in, Japan.