The mood you have set for this piece is suiting to it. You have a good grasp on the contours of the melodic figurations, so reminiscent of the vocal music Chopin was so fond of.
Look after your pedalling, there are times when you need to clear the previous harmonies from blurring into the next.
You can work on your melodic line by considering how the tone of each note fits with its neighbours. Take care where you place emphasis, and that there are not bums or dips of tone where they may be out of place. For example:
A sentence like this may not sound natural if spoken.
Topic: Chopin - Nocturne in C minor (Posthumous)