Do you have any comic samples? A couple of pages of comics are often much better indicators of what you can do in a comic than an entire gallery of non-comic work.
There's more to drawing a comic than just following a script (especially when working with writers who aren't well-versed in the visual aspects of comicking), and even a short comic would show what your composition and visual pacing skills are like.
I realise it's a catch-22: Needing a script to make a comic, needing a comic to get a script. You'll probably get some writers even without having comic samples, though they're less likely to be experienced*. So, don't worry too much about this.
But if you do want to make a comic sample and possibly get feedback on how to get it better (without a writer in the way to put the blame on), can also create your own short comic of 2-6 pages. Adapt a scene from a movie or book, or draw a comic based on an existing comic script. Or, best of all, create an original short scene and draw that. The best writers to work with are those who can think like artists, and the best artists to work with are those who can think like writers. Might as well practice those skills too ;D
* There's nothing wrong with working with inexperienced writers. Everyone has to start somewhere, and it's a great opportunity for both people. However, an inexperienced writer won't be able to be as helpful or demanding, and likely won't be a very tight storycrafter. Unfortunately, their writing ability is likely to influence how portfolio reviewers perceive the comic, so working with a writer who doesn't write well can be more detrimental than helpful.
You can certainly more than make up for their lack of skill with a critical eye and a strong knowledge of comicking and writing, but from your gallery, I suspect you do not yet have that. You will develop these skills as you work with good and bad writers alike, just remember to keep a critical eye, and don't ever be a slave to your writer. Many writers, especially inexperienced ones, but even some professionals, make unreasonable requests because they don't think visually enough. Fight them when you need to, and make a better comic than they could imagine!