These are whiteware mugs (Plainsman M370) with tissue transfers and overglazed with G2934 matte (left) and G2926B glossy (right). The matte glaze is obviously not as transparent, but enough to transmit the underglaze color well (and soften the edges). The pig is a good demonstration of how crisp the edges of lines can be once you master the application of tissue transfer designs (they are very easy to smudge).
Silk screen printing
Silk screen printing is one of the best options for hobbyists and potters to reproduce crisp and detailed decoration. But there are many details to know.