Don't be too hard on Krusty. He dislikes anything he didn't do himself. I did find his "unrealistic" comment funny, since I used a picture of real smoke to make it. 
You know how easily you dismissed my comments? Well they had substance behind them. I could tell you used a real picture of smoke to make it. It's obvious. It's also not realistic. You used smoke from something on the GROUND burning. A stationary fire. The sun hits the upper parts, the volume of the cloud creates shadows, and you get some kind of effect like that.
I dare you to find any smoke trail from a wind-fueled fire that's moving at LEAST a couple hundred miles per hour, which looks as you have made your smoke effect.
It just doesn't look that way, at all. Despite the fact that most airplanes on fire don't leave black smoke (some do, but most don't) it is a more homogenous consistency and IMO our default appears to mimick it slightly better. I say that actually hating how our current smoke looks, mind you.
One of the few examples that actually has some smoke:

Others that do not:




So the next time you only want yes-men answers, please specify in the first post. Otherwise, please don't dismiss my comments as nothing.