Using Illusions to Intimidate

[SirCorius]

I am playing a gnome illusionist in my current campaign and have a few questions regarding illusions and intimidating.

1. Are there any rules for using illusions to intimidate foes during combat? I have scrounged the books and I know demoralizing can be done in combat. Can I assume this can be done with my illusion as long as the foes fail the will save first?

2. If the answer to number 1 is yes, with the feat effortless trickery would my intimidation check become a swift action along with maintaining control of my image?

[lemeres]

Not the exact circumstances, but semi related- could you get the size bonus to intimidate if you had an illusion bigger than the target to do the talking via major image?

I mean, for example, the enemy believes that a huge dragon is telling them to run away or they become its dinner. That seems like it would be more threatening than if you made the image of a feral goblin to do the same.

[SirCorius]

In this situation it was an angel to scare some daemons and revenants.