Yay! In my previous job position, I did a lot of 3D overpaint. I got tired of this technique because I love painting from scratch, but I cannot avoid the practicality of having the perspective solved. So, I will use it but the minimum, just as a ref.
By the way, this is the model I am using for the sails ship.
It is a WIP. I am pretty stuck on it, so it is sleeping now.