Thats not much info !! How big is it ?? Can`t see the back !! Is it attached to anything ?? Under frame or what ??
Looks like maybe this one,,,Hans Richter, jazz Musician who did plaster wall art !!
https://www.google.com/search?client=firefox-b&ei=1N-vXNGELYeWsAXFpa7oDQ&q=Hans+Richter+plaster+wall+art&oq=Hans+Richter+plaster+wall+art&gs_l=psy-ab.12..33i299l3.72801.77653..81637…0.0..0.446.3900.0j8j4j4j1….2..0….1..gws-wiz…….0i20i263j0j0i22i30j33i160.jHLhoC-vp24