I'd say that each one is a little smaller than the blaze ball.
That was good. For the next one you'll have to perform the Snake, Rat, Snake, and Tiger handseals while gathering fire chakra in your lungs. This time, instead of fire you need to exhale gunpowder from your mouth and surround your target with it. As the cloud of gunpowder hangs in the air and you are a safe distance from it i want you to ignite it somehow and cause a violent explosion capable of inflicting 3rd degree burns. Asuma would use flint in his mouth to ignite it but i guess you'll need something else.
( Katon: Haisekishō ) - Fire Release: Ash Pile Burning
Rank: B
Type: Offense
Range: Short/Mid
Chakra Cost: 20
Damage Points: 40
Description: The user spews superheated ash from their mouth after performing four handseals. The ash is hot enough to cause third-degree burns on the victim. Because it's composed entirely of ash, it stays in the air around the victim like a cloud. If the user clicks his teeth, the stagnant ash will ignite, creating a violent explosion.