This is a slow, sultry, intimate piano-led song that makes a remarkable contrast to the frosty "Isadora" (q.v.) off the same LP, despite both songs having basically the same acoustic guitar / bass / drums / piano / vocals lineup. The difference between this kind of soft-rock and, say, the Carpenters, is that the latter were schmaltzy beyond endurance while Illusion provided the genuine article ...
"Face Of Yesterday" was recorded earlier by Renaissance on their "Illusion" LP, which gave its name to this group, which was actually mostly the same Renaissance lineup (with Jane Relf and Jim McCarty) before the Camp / Dunford / Thatcher group took over Renaissance. I know, I know, you can't follow the players without a scorecard in this case ...