How to transfer iphone photos to another icloud account

You can, for example, move your photos with AirDrop. If you have your iPhone signed with your Apple ID, with all your photos, and the other iPhone signed into the new Apple ID, then you can just send the photos via AirDrop. When the photos hit the new iPhone (Apple ID/iCloud account), the photos will start uploading to iCloud. Assuming Photos in iCloud is enabled on your new device and it's connected to Wi-Fi.

On your new iPhone, check that iCloud Photos is enabled, go to:

Settings > Apple ID > iCloud > Photos

You can see how to use AirDrop here:

How to use AirDrop on your iPhone or iPad - Apple Support

You can also download all your photos from iCloud and upload them to your new iCloud.

1. Go to https://icloud.com from a computer.

2. Sign in with the Apple ID that contains your photos.

3. Open Photos, download all your photos to your computer.

4. Sign out of your old Apple ID and sign in with your new iCloud account.

5. Open Photos again and upload all your photos.