Just a word on this answer: "Please find attached the requested pictures and information, for your reference. Please let me know if anything else is needed/required." I believe the word attached is a little bit odd.
[Please find attached "Monthly Status Report" PDF for your reference.] is correct, formal and polite. Naming the attachment and indicating its type helps distinguish it from malware, which is often sent as an attachment, making people reluctant to open attachments.