A fine effort, a nice ship and generally good work.
Template size is determined by the ship's size, leaving enough white space to the right side. If your ship is too tall, you can increase the template size to 485 instead of the standard 385 pixels.
I've taken the liberty of putting your ship in a template (the standard small size fits quite well).
I also changed the white colour slightly, and the shades on the funnels, as it is customary to show ships as if the light is coming from the front, and so all your vents and masts need to be re-coloured in the same fashion (if you so want it to be)
I also added the German flag.
As a side note, the small lighthouses like structures on the forecastle are for navigation lights, and since we see the starboard side it should show a green light.
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Thank you Kim for the crest
"Never fear to try on something new. Remember that the Titanic was built by professionals, and the Ark by an amateur"