Her complexion was 'beautiful'?

Solution 1:

A common term for what the OP describes is, "Her complexion was flawless." (a Google search for flawless complexion returned about 1,110,000 results)

flawless adjective: without any blemishes or imperfections; perfect. "her brown flawless skin"

synonyms: perfect, unblemished, unmarked, unimpaired

Solution 2:

Other words often used in connection with complexion are:

A radiant complexion

adjective

1 emitting rays of light; shining; bright: the radiant sun; radiant colors.

2 bright with joy, hope, etc.: radiant smiles; a radiant future.

www.dictionary.com

and also...

A clear complexion (which the OP mentions, but possibly alludes to a very narrow interpretation). "Clear" is often used to denote beauty through purity in respect of a complexion.

adjective

3 without discoloration, defect, or blemish: a clear complexion; a clear pane of glass.

www.dictionary.com

Solution 3:

I proffer, without actually specifying any color-

Fresh, glowing, healthy, lovely, perfect.

She had dark and abundant hair, so glossy that it threw off the sunshine with a gleam, and a face which, besides being beautiful from regularity of feature and richness of complexion.

Solution 4:

Then, too, one might claim that the person in question was blessed with an “exquisite” complexion.

exquisite adjective: 1. extremely beautiful and, typically, delicate. "exquisite, jewel-like portraits";

synonyms: beautiful, lovely, elegant, fine; see, Google

Solution 5:

I think beautiful would be the most suitable adjective to indicate that the complexion is... beautiful. (if you don't want to say just plain good).

As it appears in William Hogarth's The Analysis of Beauty, written with a view of fixing the fluctuating ideas of taste:

a beautiful complexion

Google Ngram might give an idea with the wildcard search also (has a * complexion):