Is the tightness sensation in my nose tip due to pressure (swelling) or is my skin trying to contract?

This is the usual evolution of the healing process and there is nothing to worry about at this point. If it was an open then it will be about three months for those sensations resolve.

Dear KEL8486,
It sounds like what you are experiencing after your surgery is completely normal. You are early in the recovery phase and it is expected to have a tight sensation around your nasal tip and feel pressure when you smile. Also after a revision rhinoplasty, I feel the swelling can be more pronounced so even when you're not smiling it's normal to have this sensation. I would refrain from making strong facial expressions like smiling too hard during the first month to prevent from putting too much strain on the tissues; but I would follow up with your surgeon regarding their normal post operative routine. She/he will likely have a feeling about it either way. Best of luck!