We are on the same boat!
I'm more of an artist than a writer, and that means I do draw my characters often besides the cover which I draw myself. I don't illustrate scenes of my novel though, but I sometimes wondered how it turn out if it was a comic.
I do think that is a good strategy to employ! It's great that you illustrate your own novel as it may give reader clarity and greater impression, also attract them to stay.
This is illustration used for cover:
This is illustration for "Thank you" message:
And this is a silly mini-comic I made without context to original story (click to zoom):
(And of course many more silly or weird things)
All from here: