I'm trying to ID the actress Kathryn Morris' tattoo. Looks like some
sort of comic book superhero.

Here's a high quality image of it:

http://www.kaleirish.com/km_tattoo_google.jpg

hi,
I give you an adress, where you can see all of the super heroes DC comic,
http://www.dccomics.com/secret_files/index.html,
but this tattoo, it`s not a super heroes DC comic,
I suppose it`s a BIOMAN, see this 
http://copix.free.fr/cb-manga/bioman.jpg.

I hope this helps.

More likely it is the Blue Ranger (Power Ranger that is)

rg