Je regret je ne parle pas le Francais. Sleepy Hollow Cemetery is in the town of Concord, Massachuseets. Concord is about 50km west of Boston. I think you could take a train from NYC to South Station in Boston, then take a commueter train from South Statiion to Concord. It would take most of a day. The distance from NYC to Boston or to Concord is about 359 km. I think a bus would be a better choice than a train. There may be a bus from NYC directly to Concord, and it would probaby be faster. I think you should allocate 3 days for the trip: two days for travel, and a day in Concord. You might manage it in two, but you would have very little time in Concord. The Concord Inn in Concord is very nice. It is also fairly expensive. It is, however, within fairly easy walking distance of Sleepy Hollow Cemetery and of downtown Concord. I think the bus may stop quite close to it as well. If you do make the trip, I hope you enjoy it. Bonne chance!

I don't know whether it's "allowed," but it definitely seems inappropriate.

no idea. sorry.

Mourning Victory, (AKA the Melvin Angel) is part of the Melvin Memorial near the central entrance to Concord's Sleepy Hollow Cemetery. There are several possible ways to get pictures of this monument. An internet search for Mourning Victory will give you many images of this memorial and the related carving in New York City's Metropolitan Museum of Art. You could inquire with the Town of Concord, Massachusetts about available pictures of this memorial. You could also ask the MET about pictures of their similar carving. Note that the work in the MET is reversed from the one in Concord and represents only the central figure, not the entire memorial.