Hi! Would you mind if I used these assets for a portfolio project for post on social media? (With credits of course)
You can use those assets however you like; Attribution is nice to have but I don't suffer if one omits it. I trust you won't abuse this right : ). If unsure then it's probably ok. I don't see my judgement to be any more competent than yours tbh.
If the above response is too vague then alternatively use this one: "I don't mind".
Share a link if you feel like : )