We get a few of them now and then, and most pilots will be happy to fill it in. Some may not fill it out as they could be too busy, or are simply too stuck up to do anything that’s not written in their contract.
Give it to one of the flight attendants while in the cruise and explain to them what you would like to do. Best time is when the flight attendants aren't too busy.
As for the photos, I've had a few passengers ask a flight attendant if the flight attendant could come in and take a photo on behalf of the passenger during flight. This is fine provided we aren't busy. On one occasion while flying near the Himalayas, I took the passengers high-tech looking camera off the flight attendant after finding the pax had a middle section seat and kept it in the flight deck for about two hours. Got some great pics of Everest and a few other fantastic sights for them. Keeps us briefly entertained also.
Cheers,
coco