Are you lowering the key or going higher? if you are going lower its a flat if its higher its a double sharp (##)
It depends if it's a single or a double bar line.
if it's a double bar line it's just there to separate the sections of the music and if it's a single bar line all it does it separate the beats in order to make a measure.
There are many ways an artist can create a sense of movement in a piece of artwork, from blurring the back of a character to show movement, or showing the movement through air waves, arrows, and others. They can also make the character look like it is moving, and make the ground have more lines parallel to the movement, which will show movement.
hope this helps
