To fill your 2, you must change second Bezier and make all exterior lines in same sens !

By example :
<path id="number2" style="fill:green; stroke-width: 2; stroke: red"
d="M 81.2613,40 C 151.761,21 110.261,90 93.7613,91 L 94.2613,91 124.261,91 L 124.261,101.5 124.261,90.5
L124.761,102 79.2613,102 L 79.7613,91.5
98.7613,71.5
C 98.2613,72 123.761,37 81.7613 50.5 L81.2613,40z"/>

For tool to draw paths, do you try Corel Draw 12 or Designer 10, svg export run fine for
paths.
You can also try VectorEye to get nice SVG from bitmap.

Michel