? in params gives error

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When I use a ? in my request I get the following error:

{ message: 'Syntax error "Expected end of string instead of "?"." at character 22: fan_count,name,picture?type=large,cover,is_verified,verification_status,link,new_like_count,best_page',
  type: 'OAuthException',
  code: 2500,
  fbtrace_id: 'FOluL7VpKOa' }

My request looks like:

const params = { fields: 'fan_count,name,picture?type=large,cover,is_verified,verification_status,link,new_like_count,best_page' };
graph.get('/me/accounts', params, function(err, res) {
        console.log(res)
        //saveFacebookPages(res, firebaseID);
        if (err) {
          console.error(err)
        }
      });

Even when I make the following request:

graph.get('/me/accounts?fan_count,name,picture?type=large,cover,is_verified,verification_status,link,new_like_count,best_page, function(err, res) {
        console.log(res)
        //saveFacebookPages(res, firebaseID);
        if (err) {
          console.error(err)
        }
      });

Same result...

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Ah, I found it. To get the large picture this have to be: picture.type(large)