Use Paint.NET graphic to draw a liquid effect smoke.
You need these plugins:
1- Liquify by "Pyrochild"
Find it in this Pack:
http://forums.getpaint.net/index.php?showtopic=20688
2- Alpha Mask by "Illnab1024"
Download it here:
http://forums.getpaint.net/index.php?showtopic=1854
