Some things to consider
- Maybe add some cavalry into the mix
- It's a bit funny how the towers can attack, but the gate can't (more detailed suggestion follows)
- The color behind the 1 in the second line of the besieged looks more dark/grey than the others, probably an illusion, but maybe you can still look at it.
Changing 1 or two of the attack routes will probably be not a good idea, as it may have bad effects to the gameplay. I tought of a way that may make a little more sense, realism-wise and still be viable gameplay wise.
The Besieger attacking 'though' the walls (by the towers) is not all that strange, (they could blow a hole in the wall or use ladders), however the besieged attacking from the walls to the outside, while at the same time not being able to use the gate, is a bit strange.
Therefore, i'd suggest:
East and West tower change to bombards (7th can still 1way attack the east tower)
Gate tower becomes two-way assault
Have the ship that is not attacking/defending become a supply/dropship that can either directly attack 7th or attack a regiment at the beach. Have a small regiment graphically be present at the open field near the east tower and a few small boats like you have at the landing point. If there is a territory for them, make it a 2-way attack between 7th and the regiment, if there's no territory for them, make the ship 1-way attack 7th.
Would make a little more sense realistically in my opinion, and would be more consistent with the bay tower.
Also, since it wouldn't really make sense for the Besieged to be able to board the ships from the landing point, maybe have the landing point only being able to board the ships for the Besieger (not sure how this would affect gameplay though). In other words, if the Besieged wants to get rid of the ships, he'd have to use his own fleet to kill the ships, or his bay tower.