If I do a reset on my iPhone will the photos taken on that device remain on my iCloud storage?

Hi there!

Thanks for posting in the Apple Support Communities.

Any photos or data you have stored in iCloud will remain there until you delete it. If you have any concerns, be sure to disable iCloud Photos before beginning the process. You can find setting in Settings > Your Name > iCloud > Photos.

It's also a good idea to create a backup of your iPhone, just in case you need to recover any data in the future.

How to factory reset your iPhone, iPad, or iPod touch - Apple Support

Best regards.