To add photographs to an email, select the photographs from your album (up to 5), then touch "SHARE" at the top left corner. Select email from the drop down list and you are good to go.
If you select more than 5 photographs, the option to email will be greyed out.
To email a section of a pages document, select the part you want, copy it, open "mail" and paste.
Note that I'm using an iPad2 and iOs5.0.1. I don't know whether the iPad has different behaviour. I believe earlier operating systems did not allow emailing more than one photograph.
Sent from my iPad using iPF