if you don't store them in a database then sending the photos in an email would be the best way to go rather then uploading them, it will be easier to track which photos are which that way.
Use UniversalEmail to send the email with the image as an attachment, IN UE, on the Attachments tab, select the submitted file option and select the file field from your form.
to limit the file size, you wil ned to use Server Validation.
For the Server Variable, click the lightning bolt icon and select the File Field File Size binding. use Numeric validation and set Max field to the maximum file size in bytes