Eljas' talent is one of the few that has any affect against Bella's shield. His talent doesn't affect the mind 'straight on', and has an unusual process, people who see him also see a faint shield covering his body, to small for others to enter. From inside the shield, his presence changes with the act of an illusion that covers his entire body
Physically, his appearance remains the same, the affect is purely mental.
Eljas can only change into people she has seen or met
Zafrina has the power to send illusionary visions into the mind of her targets, she might be able to change how she and others look to her targets