The Author takes place prior, and while it can be argued as the successor this game will be better in the long run, that should not be interpreted in any way to suggest the original wasn't also quite good. The Author has an exceptional number of fine beauties to appreciate, which may make a cameo appearance (or not) in Unbroken, depending upon your choices.
The artwork most definitely did not disappoint me. My only regret is that I didn't learn about Unbroken for so long into its initial development.