These are nothing short of brilliant; so brilliant, in fact, I have included one with ‘lights off’ so you can see that it is not a photoshop job.
There are a ton of websites where you can download pumpkin tattoos and carving templates, and that includes lots of Harry Potter ones. Even with this help I can imagine they would still be incredibly complex to make.
I was spoiled for choice when sourcing my top ten Harry Potter pumpkins - my absolute favourite has got to be Snape!
Check out the video to see an example of how it is done.