Good, good.
Although that necessarily wasn't the disadvantage I was looking for, you could have said something along the lines of it's easily counter-able, and if you are facing a rain user then performing this technique means your death is imminent x_x
Moving on,
(Suiton: Suirou No Jutsu) - Water Style: Water Prison
Rank: C
Type: Supplementary
Range: Short
Chakra cost: 15
Damage Points: N/A
Description: This technique is used to trap a victim inside a virtually inescapable sphere of water. The only downside to this technique is that the user must keep at least one arm inside the sphere at all times in order for the victim to remain imprisoned. This technique requires a sufficient amount of water, which can be provided by expelling it from one's mouth. Once trapped the target is unable to move while within it due to the heaviness of the water. Because of the density of the water it can be used, to a limited extent, for defensive purposes if performed on oneself. Water clones can be used in preparation for the technique, which block an opponent's attack and trap the attacker in the prison using the clone's own water.
For this technique I need you to mold your suiton chakra and materialize water, having it come from your mouth. After doing this manipulate the shape of the water into a sphere and make sure to keep your hand in contact with it or it will dissipate.
Once again - advantage, disadvantage, and a battle usage for this.