Screenshots [from the open beta test of Heroes 5].

I found some more screenshots:)

Here are the Castle sieges for each town:

For Academy:
http://www.qsl.net/us0ya/osada/academy_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/academy_2.JPG - Side view
http://www.qsl.net/us0ya/osada/academy_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/academy_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/academy_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/academy_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/academy_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/academy_8.JPG - Top view V^

For Dungeon:
http://www.qsl.net/us0ya/osada/dungeon_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/dungeon_2.JPG - Side view
http://www.qsl.net/us0ya/osada/dungeon_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/dungeon_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/dungeon_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/dungeon_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/dungeon_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/dungeon_8.JPG - Top view V^

For Haven:
http://www.qsl.net/us0ya/osada/haven_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/haven_2.JPG - Side view
http://www.qsl.net/us0ya/osada/haven_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/haven_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/haven_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/haven_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/haven_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/haven_8.JPG - Top view V^

For Necropolis:
http://www.qsl.net/us0ya/osada/necropolis_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/necropolis_2.JPG - Side view
http://www.qsl.net/us0ya/osada/necropolis_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/necropolis_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/necropolis_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/necropolis_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/necropolis_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/necropolis_8.JPG - Top view V^

For Inferno:
http://www.qsl.net/us0ya/osada/inferno_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/inferno_2.JPG - Side view
http://www.qsl.net/us0ya/osada/inferno_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/inferno_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/inferno_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/inferno_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/inferno_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/inferno_8.JPG - Top view V^

For Sylvan:
http://www.qsl.net/us0ya/osada/sylvan_1.JPG - Siege from the gate's profile view
http://www.qsl.net/us0ya/osada/sylvan_2.JPG - Side view
http://www.qsl.net/us0ya/osada/sylvan_3.JPG - View from inside the Castle, looking at the enemies
http://www.qsl.net/us0ya/osada/sylvan_4.JPG - View from the Castle, looking at the enemies in profile
http://www.qsl.net/us0ya/osada/sylvan_5.JPG - Let's take a look at the gate:)
http://www.qsl.net/us0ya/osada/sylvan_6.JPG - It seems the focus here is on the watchtowers
http://www.qsl.net/us0ya/osada/sylvan_7.JPG - Top view <->
http://www.qsl.net/us0ya/osada/sylvan_8.JPG - Top view V^

P.S. I formatted everything in the agreed-upon format:)