We know that mesmers have the three little circles indicating whether you have an illusion summoned, and how many. What I think would make things much better is to make circles look different depending on whether you have phantasms or clones summoned.
As it is now, I can have three illusions, but can rarely tell whether I have two phantasms, three, or one. I can always look at the battlefield, but it’s often too hectic in group environments.
I think it could be like this: Summoned clone is purple circle. Summoned phantasm is pink circle. Empty illusion slot would be an unfilled circle.