Don't use the fill tool. It's the tool of the devil. It leaves behind white marks that you have to individually color in. Instead use layers. Ink on a top layer and color on the bottom. Those squiggles are very distracting, try adding something else. And if you have trouble drawing arms and legs freehand try using the bezier. It can get get curves and shapes. lso, look at some anatomy books or anime books to see how the body looks and practice. Again if yor just sketching you don't have to send.

If you use the other tools then yer drawing get better.
That is true.

PS: I likes the squiggles