{
  "$schema": "http://columnformatting.sharepointpnp.com/columnFormattingSchema.json",
  "elmType": "a",
  "attributes": {
    "href": "@currentField",
    "target": "_blank"
  },
  "children": [
    {
      "elmType": "img",
      "style": {
        "width": "150px"
      },
      "attributes": {
        "src": "=if([$LicenceType]=='Security Clearance','your image link',if([$LicenceType]=='BEUL','your image link',''))"
      }
    }
  ]
}