i don't think ulysses spends much effort describing faces.
we'll have to start with generic male and female faces and tweak just the features joyce describes.
standard emotional expressions are also probably available.
where we have a photograph of the original person we can autofill details.
where joyce renamed characters, the names will suggest faces to most readers, and illustrators will be rewarded for secondguessing these.
(here's a very basic mathematical face-generator:
police sketch-artist software must have a serious mathematical representation scheme