Perhaps you could swap one of the three more Romantic pieces, (Schubert, Brahms, Chopin), for a piece of the Baroque period. Perhaps a Scarlatti Sonata?
K.27 would substitute nicely for the Schubert in terms of tone, but would also contrast pretty well with the other pieces in my opinion.
If you plan on playing the pieces in that order, then I think the K.27 would fit very nicely with the Brahms!
Other than that, it looks pretty good!
