Welcome
Nice small ship (maybe a tiny bit to small for 1950s warship ?) and if its not a warship then some colouring would be very nice (and make the deck/funnel stand out).
I agree with making bridge stand up a bit (and giving a flat rear deck for a MG later with a raised funnel)
As a CG ship I would fit 1 x 40mm (on bow move mast back to make it fit and 2 MGs on bridge side/rear deck)
Fit it with a small boat (maybe side ways on top of cargo deck ?)
Looking forward to more.
ADD
Just to add size wise,
- Flower-class corvette have a Length of 205 ft.
-1950s Ross Tiger, a traditional side-winder fishing trawler Length has a length of 127.6 ft.
- Isles-class trawlers 164 ft (50 m)
In WW1 There were two basic types of Admiralty-built drifters, wooden hulled and steel hulled.
-The wooden hull vessels displaced 175 tons, were 86 ft (26.2 m) long, with a beam of 19 ft (5.8 m). They had a speed of 9 knots and carried one 6pdr gun. 91 wooden hull vessels were launched 1918–20, and 100 similar Canadian-built craft were ordered in January 1917.[1]
-The steel hull vessels displaced 199 tons, were 86 ft (26.2 m) long, with a beam of 18 ft 6in (5.6 m). They also had a speed of 9 knots and carried one 6pdr gun. 123 steel-hulled vessels were launched 1917–1920, and 48 others were cancelled
So I think you are little small unless you have no choice and only want very short range.