I REALLY like these designs! Nice work. Some ideas:
1) Can you make the G, S, F somehow different? 2) Perhaps the arms could have open hands and a bit more feminine? 3) Perhaps some colors for the text (or the logo)
28 is my favorite! Some changes: 1) Please use the blue of #33 2) Is it possible to have the hands open like palm strikes facing you? 3) the 'get|safe|fast' below the text seems redundant. perhaps it can say "practical self defense"