Papers on Literature and Art
p41“The girl in the "Return of the Druses" is the sort of nature Byron tried to paint in Myrrha. But Byron could only paint women as they were to him.”
Also reprinted in New-York Daily Tribune. Counted once, at its first appearance.
Fuller, Margaret. Papers on Literature and Art. New York: Wiley and Putnam, 1846.
Inferred Fuller names Byron explicitly and the character Myrrha. Fuller uses Byron's Myrrha as the benchmark for an idealized woman character that Browning surpasses.