Please don't take this the wrong way, but these look like you didn't put much effort into to them.
The eyecandy one actually lacks eyecandy, sure theres some but thats a portion of the map.
At the top it looks like you just stuck fortresses together.
For the fall of Rome, it wasn't good. This was not an eyecandy map, nor was it a great single player scenario. The only triggers i could see was music and a camera track. You just placed things on a map and made it a scenario.
All you need is practice, if you honestly have no clue on triggers, map design, and other things, check the forums and the scenario design library.