Measuring 24x36", stretched and mounted on canvas, ready to hang on your wall as is... this a an excellent prop replica featuring Marc Davis' "A Portrait of Things to Come."  There were 2 versions of this done by Marc Davis, a sketch (which is more easily found) and this "final" copy (only one copy was painted and its my understanding that the original sits in the Pirates ride at Disneyland).

Last photo for reference.  Third photo is a close up to show quality.  This is a VERY nice display piece!