Hi java,
In standard repertoire I play mostly late romantic Russian music now--Rachmaninoff, Bortkiewicz, Scriabin, and Catoire. Most recently in Audition Room I've been posting my recordings of Catoire. In previous years I've also posted a lot of French music--Faure, Debussy, Ravel, and a bit of Poulenc. So yes, I suppose there could be those subliminal influences present, although they didn't come consciously to mind while I was playing. I was corresponding with another member today who thought the style of this improvisation hinted at John Ireland in a way. So I guess the parallels drawn might vary by listener. My own intent was to create an improvisation that would exude beauty and render a lush, ultra-romantic sound--my kind of music. The key was in C, but as I went along, I found opportunities to feature the F# sound. The more I did it, the more I liked it.
Regarding structure, I wasn't thinking formal structure per se during the recording session. In improvising, I believe that where it's totally impromptu, to start with structure might kill it. From just this one experience improvising, I conclude that you have to start by playing, going with the flow, listening to its direction, and adding some structure as it progesses. I was definitely intent on not meandering too far and too long from the principal theme. It would be easy to go far afield unless you keep that danger in the back of your mind. I also decided as things unfolded to inject subtle variations into the reiterations of the main theme to keep it interesting. To do that I had to make decisions within about a one-second time span! That's something I learned about improvising, you have to think quickly in the moment. Then the challenge is for the reflexes to execute the intent. Sometimes it can lead to a klinker, which has to be skillfully and quickly cleaned up. Also, insofar as structure is concerned, I just now, listening to the recording, noticed that the short introduction and the end of the coda are both different ascending scalar figures--bookends so to speak, and a happy coincidence at that. I had a notion I wanted to start the piece that way, and the ending was decided in a second without recalling the beginning of the piece. So I can't take credit for that neat piece of structure--it just happened.
I'm glad you enjoyed listening to my improvisation. Today there is so much emphasis on minimalism, extreme dissonance, polytonal music and the like, that I didn't quite know how a traditional neo-romantic piece like this might be received. So far, a lot of people have liked it.

If I were to do another improvisation, it would be neo-romantic too, as that's my sense of the ideal musical aesthetic. And, if I were to be the only one who enjoyed it, that is, The Last Romantic, I'd still improvise that way!