Your art's good, just make sure you can do it quickly. A comic page is around 5-8 panels, which means you need to produce 5-8 paintings per page. Time how long it takes you to do that many paintings and that's about how long it will take you to do a page. If you can't pump those pages out very quickly, that could lead to burnout. There are ways to mitigate this of course, for example, I have a specific pipeline for my art, and I cut about half the steps out when I paint panels to expedite the process.
I would do a couple of pages first before you throw your hat over the wall, just so that you're prepared for the amount of work making a comic requires. It sounds fun on the outside, but the first comic I worked on, I was super motivated, then burned out and stopped because the work buried me. My second comic actually made it off the ground because I knew exactly what I was getting into. This is one reason why people say to do a small project first, before doing the project you really want to do.
Another tip is that good art can draw in readers, but your story is what keeps them there. Don't rush through the writing, make sure it can really stand on it's own. Do your research, and don't be shy about tossing stuff that you've written. I rewrote Heaven Hunters about a dozen times over the course of two years before I landed on what I've got now. Erasing stuff isn't a waste, it's progress.
ALSO, get comfortable drawing backgrounds, and drawing them quickly! Good backgrounds will draw your reader into your world, and are super important to comics. In illustration you can skimp on the background, or just kind of draw something abstract back there or whatever, but comics do not work that way. You're telling a story about characters that need a world to live in, so you've got to deliver.
