Unable to add picture with url parameters on Facebook feed dialog (Direct URL)

I was wondering how could I add parameters to my picture URl on this example:

https://www.facebook.com/dialog/feed?app_id=...&link=...&picture=www.blablabladotcom?parameter1=1&parameter2=2&name=...&caption=...&description=...&redirect_uri=...

I tried with %26 encoding and picture doesn't show up.What is strange is that when I try %26 on the redirect_uri parameter, it works fine.Any tips about this one??