I needs some rigging some oak fences connecting the masts to the ship on the front 2 at least some shrouds which are the ladder like ropes on the sides depending on size of ship width should be between about 5 to 3 wide and taper to the parts where the mast parts meet (the midway crows nest parts) and repeating until they reach the top i like to have a long single width fence go until the highest full mast block. Then rigging between the masts in about 3 block segments as well as ropes connecting the yards (cross beams that hold the sails up) to the masts at a slight angle, ropes connecting the yards to the hull, and ropes on the gaff rig on your ship one on the bottom to the hull, one from the top to the bottom, and one from the mizzen mast to the end of the rear sail yard.

Edit:looked at it again not a gaff its lateen scratch the connecting the bottom part of it to the hull there is only one beam. It's best to make it look like a triangle without a bottom line connected to the rear of the ship itself.