Remove the lower of the two-on-each-other casemates. For a ship this size eight barrels/side is not nececcary(wordbutchering).
Hmm ... Well, I assumed that they are so and so will be removed at the first modernisation, when it turns out that they are of little avail.
And as some other people has noted: Change the funnels. They are both strangely shaped, and the colours are quite odd, to express it mildly.
Ohh ... Well, I think about it. So it would seem - which funnels just not head and share it ...
You could also add some more small boats and life rafts.
Ok.
The aft mast looks a bit neglected in detail terms. Some rigging would solve that problem (Maybe some rigging between the masts as well?)
Hmmm... Ok!