Nice photo and good work on the edit to make the water pop. Cellphone cameras are pretty good, but I still prefer a dedicated camera for most situations.
Most instances will prevent you from uploading "large" files. For lemmy.world, I think the cap is around 2 MB. It's actually somewhat frustrating because my (most/all?) client apps allows you to upload photos, but the upload will fail 90% of the time. There doesn't appear to be an API to check for this size limit and/or the client(s) aren't using it and resizing a temp copy of the photo before upload. I often wonder if this is contributing to a somewhat low post level... I make the vast majority of my posts from my PC for this reason if they're going to have more than one photo.