If I view a photo on my iPhone in the Photos app, I see a delete button (trash can icon) at the bottom right of the UI. Are you not seeing that? That button will delete it both from your device and your iCloud.
You can also login in via the web to icloud.com and delete from there.
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You can also login in via the web to icloud.com and delete from there.
Also I just noticed that some of my older posted tuscl photographs seem to be cropped now by the app.