Well, that depends… I would call it a selfmade card, not necessarily a hand made one. But that obviously won’t help to answer your question.
I’m sure that some postcrossers wouldn’t like it because it wasn’t bought at a shop from a professional commercial publisher at the place of origin. There is quite a wide range of opinions what a “real” postcard is. And some feel alienated about these spooky postcards which are not “real” postcards 
(whatever that is).
My personal opinion: choose a good quality picture with a high resolution and design a good looking postcard back. If you would be very audacious, print some name on the back (e.g. Eagle eye postcard Limited. or something like that) and a pseudo order number. It’s fake. But everybody will be happy.
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