You look good, perfectly fine for a Helpdesk role. It looks like you care about the job and are taking it seriously. Sure, a simple tie would take it up a notch but I wouldn’t consider it mandatory. Also, the belt looks odd, like it’s too long perhaps? The belt should go counter clockwise with the tail extending a few inches past the first loop on your left side pointing towards the back. Usually a belt size is a couple inches more than your pant waist size. For example I wear a 36" pant and 38" belt.

Good luck with you’re interview!