Wow that's quite an awesome ship already! Lovely colourscheme and overall the shape is good as well.
But there are indeed a few things that can be improved. I'll try my best to explain
First the bow. Actually the gold line there is very nice. Unfortunately the scheg (?) is a bit edgy, but I don't know a better way to do that...
As for the headrails, usually the top beams are longer than the ones below. The curve inwards is good, but I think they should be curved downwards as well.
You could try to use Vesta's headrail technique with pearl gold jumpers.
Again I'm not sure how to do this with pearl gold..I guess you had the same problem.
What you could do at least is to remove the pearl gold plates which I encircled in red on this picture.
The line shouldn't go as far back as the headrails.
On that same picture you can see the green circle.
I think the bow can be shortened a little bit. It's round at the bottom, but at the top there's a sort of cut out (like here)
But that's not neccesary because Trincomalee has an all round bow for example.
My other suggestions are for the stern. On most frigates, the stern deck is less wide as the rest of the deck, and yours gets wider.
This can be achieved by simply adding a roof on the side galleries (like on Achille and Vesta).
And I think you could place the stern windows a bit higher but that could just be personal taste.
That's all. Good luck and keep it up