I'm usually hooked in by an interesting premise or interesting looking characters and then stay for the writing, some other extra stuff that really makes me fall in love with a comic is
- Natural feeling dialogue between characters along with interesting character interactions in general. Gotta get me invested with your characters if you want me to continue reading and one way to do that is make me excited to keep seeing two characters interact.
- Diverse casts!!! I'm a really big stickler for same face and repeating body types, it can get a little boring visually
- Less monologue and more people talking to other people. Especially in comics, having too much internal narrative can go very wrong and may fail to hook me in. Of course it can also go very right given the proper mood and visual storytelling.