Honestly, I'm not sure we can allow a third party to use the pictures on Numista : we have agreements with other websites to use their photos here, but that doesn't include to share those pictures outside the platform.
If SCWC want to use the pictures posted on Numista, I'm afraid they will have to ask the people / websites that are present in the copyrights of those pics.
At best, Numista can allow SCWC to use the pictures without copyrights on them, but you will have to ask Xavier about that.
Edit : A bit late, Jarcek answered when I was replying