I really like the idea of colour schemes for ships. However, did you notice that French, Spanish and Russian ships lost their specific backsides and got the British version. Russian ships have a square backside and Spanish a more round one, same goes for the French, so you will have to colour ships for each faction individually in order to preserve their historical backsides. The French "fluyt" should have the upper part (now grey) colored in light blue so that the fluyt's whole backside is light blue (you've already colored some of the French ships with it but their backsides are black so they should also have them light blue) and the middle black track should be removed as well as changing the bright yellow to a pale yellow (some French ships are colored in pale yellow).
Something like this:
This is easy to correct. Also, it would be better to colour ship cannons in black if possible. The Portuguese also have a specific colour scheme but they were mostly black and white in the late 18th century. Great job!