The letter s is notoriously tricky. Start with the central diagonal which *almost* becomes horizontal in the center. Then add the top and then bottom.
I am showing you two variations here. The top David Harris version is based on the Edward Johnston style which some say was closer to a Gothic hand. The bottom Gaye Godfried-Nicholls version is closer to the Ramsey Psalter style which is based on the original English Caroline minuscule (they both are just slightly different variations).
Since the letters are upright and straightforward, good spacing is essential. The spacing on my second variation is much too wide. You seem to have a very good aptitude for spacing!
I hope that helps. (It's been a long time since I did broad pen work so it was fun to play.)
