Oh, boy this seems is difficult: Not only did the autotagger insist on Prince Valiant beeing a girl, but my usual parameters for training didn't work. But here it is:

Trained with Dreamshaper V8

I do recommend using dreamshaper, which replicates the style best.

Further settings that worked well for me are

Euler a (other samplers work too though)

32 Steps

6 Cfg Scale

Influence .9 or 1