<prompt> Translate the following text to EnglishPicha zake za watakatifu, watawa, na wafia-imani huonyesha ustadi wa kuchora usio na kasoro, muundo, na utumizi mzuri wa nuru na kivuli.  <response>: His portraits of saints, hermits, and martyrs reveal impeccable drawing skills, composition, and keen exploitation of light and shadow. 