Lets just say it needs work. Add objectives, they tend to add a more 'professional' feel to the game, if nothing else. If you don't know how, think of it as a trigger, nothing more. Set objective one as always, and the next objective's condition to be whatever it was that was the first.
As far as the maps go... add trees, rocks, flowers! put some fish in the water. Select beautify water (Up near the top) select your water and poke the button in the bottom left.
When you use a timer to set defeat, make sure it's long enough, and that the player knows it's there. There is a countdown trigger! It displays in the right hand side of the screen, just like in the campaign.
Decide WHY you need to get that relic, and then tell the player. You know like in the objectives, or in dialogue. "If we don't get that relic our enemies to the north will have too much power and they will attack us!"
The possibilities are endless! If you need any help, just give me a buzz. I tend to hang out in the Age of Mythology Heaven forums, generally in the Scenario design and disscussion area. I think in this case they might let you start your own topic.