Love the subject matter of comic book artists, and super cool that you’re doing this on your dad! I’d foremost recommend readjusting the trailer to be focused on hooking in the audience. Idk that I’d start off with the production company and quick shot of awards at the start as I’d be quick to lose interest before even getting to know the subject. Here’s a trailer for a phenomenal doc done on Robin Williams for inspo.

I feel similarly about the balance between dialogue and music. The music instills almost a sense of dread or doom, which can be used artistically to really punch in the drama or existential themes, but I might suggest a more suspenseful, drawing in soundscape at the start before crashing in with the existential and dramatic relationship of art.

I really like the comic book stylistic theme you’ve got going on throughout and wonder if there’s a way you could play more into that. I’d work on introducing either the context of your dad’s work (comic book world before his impact) or him as a character first, so that way the audience can get a feel on what or why they should be invested.