how do i download original photos from iCloud direct into photos app

saying icloud photo library,but i do not have enough storage

What kind of storage? Does it refer to the iCloud Storage or the storage on your Mac?

• If you do not have enough iCloud storage, create a new empty Photos Library (see this help page: https://support.apple.com/guide/photos/create-additional-libraries-pht6d60b524/m ac). Downloading to an empty photos library will not require additional cloud storage.
• If you do not have enough storage on your Mac, create the new library on an external drive, formatted MacOS Extended (Journaled). Then let the iCloud Photo Library to this external drive. This document describes, how an external drive should be formatted to be used with Photos: https://support.apple.com/en-us/HT201517

Create an empty Photos Library and make it your iCloud Photo Library on your Mac - then wait for the photos to download from iCloud Photo Library to your Mac.

See this help page: https://support.apple.com/guide/photos/from-icloud-photo-library-phtf5e48489c/ma c

If you use the web interface at www.icloud.com to download the photos, you can only download the previews of the edited versions, not the original RAW files.

totally confused now.so where are the original photos

If you have been using iCloud Photo Library on your iPhone, the originals are indeed in iCloud. Use iCloud Photo Library to store photos in Photos on Mac - Apple Support

And the most efficient way to download them all would be to use the Photos.app on your Mac to download them from iCloud. Syncing your Photos Library with iCloud will download the RAW originals to your Photos Library. If you use the web interface to download the photos, your RAW files will download as developed JPEGs, not the original RAW files. and it is clumsy to have to click each thumbnail individually while holding down the command key to select all photos.

The problem will be, that you cannot enable your current Photos Library as am iCloud Photo Library, because then first your complete library from the Mac will upload to iCloud before you can download the photos from iCloud. So, if you are not currently using iCloud Photo Library on your Mac, create a new, empty library and let the iCloud Photos download to this library.

To add to the above, whether using a new Library or adding to the existing Library.

Open Photos, go to Photos/Preferences/iCloud and set up syncing. Then go to System Preferences/iCloud, sign in, and check Photos syncing.