I like building ships, and find that I have spent some time building a number of oar-propelled boats, from the Bireme Greca to the Lake Champlain Galley.
While armed, most galley warfare was accidental - with a couple of singular exceptions, they were very inefficient fighting machines. They were really designed to move troops (a bit like the land based light horse divisions).
La Reale de France
The original galley was 66m (stem to stern), 10.2m (beam amidship), 30m (beam including oars) and 42.8m (height keel to mast head). A key component in Mediterranean fleets (and the Great Lakes of Northern America) these were used as troop carriers (a bit like cavalry) unless becalmed conditions gave them a tactical advantage. I have not found a reference to naval engagements for this ship - perhaps it was not risked.
A French Xebec commissioned in 1750 by Minister Antoine-Louis de ROUILLE, Count of Jouy. Widely regarded as the high point of this style of Mediterranean raider (here shown becalmed with 10 oars (25%) extended for shore navigation.
I built most of these models a couple of years ago. I give all my wooden boats a spring clean each year by turfing out the spiders and putting them out in heavy rain (a simple treatment recommended by Harold Underhill in his superb book on plank on frame models - Glasgow 1960).
Images: In most cases above I started with a seascape duplicating long low waves, liquified the waves to create patches of still and disturbed water, cut in the galley adding reflections and sunlight, before finishing with fog.