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If you have CC2017 (and I think from CC2014 upwards) there is a very capable Flames filter that can be found under Filters/Render/Flames.
You need to have a path created (with the pen tool for example) and then play around with the parameters.
Have a look at this tutorial http://www.digitalartsonline.co.uk/...ames-add-realistic-fire-in-photoshop-cc-2014/
Cheers
John
*EDIT
Another thing - I know you said you have sorted the paint drips - but have a search for "Blood" drip brushes - It is just down to how you colour them as to whether they look like blood or paint drips.
how about using filter 'cutout ' on a stock-photo of flames
https://dl.dropboxusercontent.com/s/iyd2ym9rk9hfm70/filter cutout.jpg?dl=0