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