Go to the picture album of your choice, or camera roll on the iPad.
Then in the menu across the very top of the screen tap onto edit.
You should see a greyed out "share" option appear at the left end of the menu.
Tap on the photos you want to email. A tick on a blue background appears on each selected photo. Chose upto 5 max for mailing.
Tap share. The email form appears for you to complete and email the photos.