The Tjeld Class seems very crude compared to the rest of the ships. It'll definitely need some more work. The hull especially.
Here's a drawing of the Danish Søløven class. It's about ten years younger and quite a bit larger, but the basic hull shape is the same.
You'll need to mark the waterline with a black line.
Also, the proper name of the class is the Tjeld Class.
The Nasty class is the American PTF which carried a rather different armament.
This website should have all the information you could ever need if you want to draw the Nasty.
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That which does not kill me has made a grave tactical error
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