Hi, that is a great composition with really good interaction between the two violins and nice modulations.
Only remarks the harsichord part only in the bass cheaf looks a bit rear to me, I see a clear trio sonata texture. What about writing it for Cello and 2 violin? Harsichord part will be then played on the bass harmony giving some chords. Common practice would be write some throuthbass numbers unter the baseline, but it could be laborious if you are not familiar with that and one need a clear idea of harmony and dissonances, on the other hand could be a good exercise of voice leading and even inprofe some "weak" melodies.
Then also the double notes on the violins look a bit out of the style and distract a little bit, also I see some unresolved dissonances.
Final point the last bar is a bit strange. You resolve first in minor and than in major. But are fine, but I would choose one of those. One think I feel very common practice is resolving to the major chord with a decorated forth suspension on the harpsichord part.