Probably not feasible on the tactical map, just because in the heat of battle it can get pretty crowded with dots, lines, and crosses everywhere. However it would be neat to have a little box in the class/ship view windows which optionally has a little picture of your ship that you could select from a file. That way if a player wants to make a little art of their new 50,000-ton dreadnought it can show up somewhere in game and bring the player crushing sadness when the ship is ripped apart by Precursors joy.
Ideally not filled with a random ship from the ship art folder, but I suppose using the racial ship icon as a default would be okay too if an empty box in the UI seems awkward.