The character animation in this product has the perfect balance between that modern skeletal deformation quality (that some cartoons make too much use of) and uniquely drawn frames. This leads to a remarkably smooth result.
The animators were also quite bold in making sure that heads and poses turn around a lot and convey depth and volume (especially of facial features).
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This is produced by Mercury Filmworks, of which other productions follow the same rich visuals.
I'll make sure to use this as reference when doing animation myself. If you know of other cartoons or products of animation that have this or better quality, make sure to share.