Help identify the author of this picture, presumably Yushkov Phaedrus Ostapovich

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Сообщение от Dmitry C

is complicated by the fact that his works are very few survived.
Yushkov is tentatively ("Yush" incomplete "f" as a sword, said to belong to the military. Only the "C" certainly contributes.

By Fyodor Yushkov losifovich (Osipovich) Yushkova son Joseph I. (1788-1849), sculptor-lover, a native of St. Petersburg, this picture has nothing to do.
Known picture of F. O. Yushkova "boarding. One of the British naval war."
There clearly is a signature on the right in the corner. From the above, nothing in common.
The capital letter F, for information, written at the time and the military, too O as a horizontal line in the middle.