Any fine and detailed painting, usually a portrait, executed on a small scale, in watercolor, gouache, enamel or oil on a support of parchment, ivory or copper
Miniature is used to describe something which is very small, especially a smaller version of something which is normally much bigger. miniature roses He looked like a miniature version of his handsome and elegant big brother
{i} small-scale representation, something which has been made smaller; very small portrait or painting