It's not possible to get a query image assets variations using GraphQL, as it ends with an error.

Steps to reproduce:
1. Login as admin
2. Create a new Content Type named "MyImageAsset"
3. Add image asset fieldtype
4. Create a Content Item using that Content Type
5. Regenerate GraphQL schema and clear cache
6. Enter query similar to:

{
  content {
    myimageasset(locationId: 57) {
	newEzimageasset1 {
        variations(identifier:[small]) {
          name
        }
			}
    }
  }
}

result:

{
  "errors": [
    {
      "debugMessage": "Property 'value' not found on class 'eZ\\Publish\\Core\\FieldType\\Image\\Value'",
      "message": "Internal server Error",