For helpdesk this is perfectly fine, but if you want to upgrade a little bit I’d grab a pair of pants with side or slash pockets rather than the kind you find on jeans.

Is your belt on sideways? hard to tell but your buckle should be on the front. Generally you should match your belt to your shoes, I prefer brown in both cases as black can look too institutional.

You can practice putting a small fold on the tucked in part of your shirt to take up the extra slack around the waist, otherwise the shirt fits well.