This is the first time I render candles, the ones included with the environment I chose (Primrose House), and it is underwhelming that at least these ones don't include a proper flame shader. It is just an emissive light. I had to mess with Photoshop to insert a flame in the candle closest to the couple (the one closer to the camera is quite out of focus, so I thought: why bother?), and I'm not very happy with the result.

But it is what it is.