Another way to distinguish femlales from males is by looking at the shoulder region, just behind the head. In many females (tincs & azureus) the shoulders will be larger and more pronounced an is quiote noticeable compared to males. This is, of course, another artificial means of sexing but I have had decent success with this method combined with toepad and body size comparison. If you can get some more detailed shots from the top and sides, it may help a little. Hope this helps.