cybersix said:
Can I cut a bit the very long outer leaves ?
You can if they bother you but if you do it bear in mind that you're removing some of the "food factory" when you do so (leaves function like solar panels, they make the energy food for the plant). You're also removing the nutrients in those parts of the leaves. Sometimes we do things for aesthetic purposes that aren't necessarily in the best interests of the plant but it's not likely to kill them.