If you don't have many photos, you can go to the native photo app, show all photos as thumbnails, click on the send button on the upper-left corner, then select which photos to send. If you have many photos, it might take too much time to scroll and do this.
In the native photo app, you also can copy photos individually and paste them into emails, if you like.
If you have many photos and albums, consider using an app. Evernote is free, for instance, and lets you select multiple photos from different albums. It also lets you zip files, in case the recipient's email account has a limit on file size.