The following images come from the Korean manhwa Aura From Another Planet, chapter 35. I can guess that the gestures they are making refer to monetary amounts, but how much are we talking here?
As the comments said, the first one means generic "money" (she's making the shape of a coin with her thumb and index finger.)
The other two, I have no idea, but considering that the comics was full of absurdist humor, I think the author just made up some nonsense gestures. (These two girls are aliens, after all, if I remember correctly.)