Great icon, but the thumbnail looks quite blurred. Either make a thumbnail more than 100 pixels high (I don't know the exact value, but it seems to be 128 or 200 px), or do this trick in Inkscape: open your SVG file, resize it (in File->Document properties) to be 128 px high, and *then* export to bitmap, also 128 px high. This way you get nice small thumbnail. (After that, close the SVG without saving ;)