if you have photoshop the way I like to do it is to go to render > flame
then select a path
http://prntscr.com/pujl5c
also there are tutorials out there on how to do them, the one below is how to render it in photoshop
https://www.digitalartsonline.co.uk/tutorials/photoshop/use-render-flames-add-realistic-fire-in-photoshop-cc-2014/
There are also a lot of brush options that help you create them that you can download from deviantart too.
Edited at November 9, 2019 01:56 AM by Valentine Stable