Interestingly, the plaque has been covered with gold leaf, which then had the picture applied over the top, which is maybe why the paint is flaking off! It is also the reason that the paint is slightly 'muddy' looking in places - and explains the 'swarthyness' of the angel's complexion.
And he isn't all that pretty, Sue! His eyes are actually rimmed in red and the 'whites' are gold, which gives him a slightly demonic look in close-up!
Personally, I do wonder whether he's perhaps a tad more renaissance-looking than Russian
Oh, and I forgot to give dimensions - AGAIN! It's 6 inches high by 2 and 1/4 wide and about 1/4 inch thick.