It's great to see someone who likes to improvise in such a style! Now, while I'm not a really a big fan of John Field's work, his style is generally very beautiful in its sophistication. Though his music lacks the morbidity of Frederic Chopin's, in no way does it lack depth. As a melodist, he is definitely the equal of Franz Schubert, and his sense of structure and counterpoint comes close to rivalling Clementi or Hummel but is definitely overshadowed by Beethoven. He is rather conventional harmonically, influencing Mendelssohn in this respect.