Don't conflate design with art. The problem with some "artistic" hobbies, e.g. photography, drawing, painting, is that none of these solve problems. That's why they belong in the realm of art, subjective and usually emotionally charged. You can't gauge a person by their photographic eye because for all anyone knows, it might have been a random shot or pure luck from a burst sequence. Composition, exposure, subject, these elements showcase skill and understanding of space but still, it mostly ignores the process of creating a viable solution.

Sketches and such should be fine. A portfolio layout simply tells someone what sort of visual aesthetic you likely follow or mimic, not much more than that. Don't try to be someone you're not at this point. Your photos lack focus, or any focus I could discern. The rocks one you can probably turn into some project but that'll depend on your existing knowledge and how much time is left to complete it.

If this is a spur of the moment decision, consider taking another year to think it over and do something related in the meantime.

Perhaps photo journalism?

I am in the same boat. Studied finance undergrad and now I am looking to do a M.arch. I also have questions of what to include in my portfolio, which is now mostly sketches and design work. I was told it is best to showcase a variety of what you have since it is not expected to for you to have architecturally related work. Any other advice would be appreciated though!

I don't see anything in that photography portfolio that suggests any kind of spatial thinking. I agree with @bugsmetoo; you should wait another year and spend the interim actually preparing a real portfolio.