Not an expert either, not at all. But I'm working on improving my floorwork as well. What helps me is watching other people do floorwork and finding out what I like, then just doing it and videotaping myself. Mostly the things I feel silly about doing are the things that look silly in the end. What I found out is the effect of a movement is much more profound if you are doing it because your body feels good doing it and likes to be watched doing it compared to just showing off what you can do, if you know what I mean. So, take your time, play around and enjoy your body. Be courageous and let yourself go.
And yes, I too like straight legs and pointed toes, an archy back... also changes in speed and rythm, deliberate and confident movements... But as I said above, I'm not there yet, so if you come across any new insights, please share with us. Good luck to you!