space between images

Your question is not strictly related to our plugin, as it depends on CSS. You may change the spacing by modifying your theme’s stylesheet.
In particular you should change the following (located at line 186 of your theme’s style.css):

a img.alignnone {
  margin: 5px 20px 20px 0;
}

to something like this:

a img.alignnone {
  margin: 5px 5px 5px 0;
}

Note: the above change will affect all images with class alignnone. If you just want to let it be applied only to a specific widget or sidebar, add CSS rule with a more specific target selector.