For those interested, here's how i did it:
Shaped a heart of thin wire (3-fold) with an extension at the bottom to mount it on a tripod. wrapped newspaper strips all around it, soaked it with white spirit and placed it on the patio at night. Set it on fire - et voilá. tripod mounted camera was about 10ft away.
The border was made by adding canvas size (white) of 2 px, selecting the new area with magic wand (no feathering), filling with gradient.
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Excellent photo. Putting a gradient on the frame was gutsy, but it works. I'm sorry, but I have no criticisms here because none are necessary - good job and thank you for sharing.
Great shot and lovely idea. I think it might be a bit stronger without the border to accentuate the contrast between the black background and the flaming heart.
As I've commented on others so far, a recurring theme seems to be sharpness. I understand that in a lot of cases, low light forces a long shutter and so the flames are blurred, and mostly this is very artistic and a good thing, but it needs to be offset by a sharp focal point. If the shape of the heart was a lot sharper then it would complement the flames more effectively.