Hello and welcome! I'm of no help with the picture, there are certain species that can be easily identified by certain colors or markings but I have no idea about this species, I apologize. A DNA test can easily be done to determine the sex of this bird, though. You send in a few feathers to a company and they'll determine what gender they are based on how the feathers test.
Was there a reason you wanted to know if it was male or female? Do you own this bird?
The DNA sexing service link kindly provided by "plumsmum" accepts samples globally. You may have to determine whether Sweden has regulations regarding transport of animal substances. This is a paragraph from the site offering some explanation:
"If you only need submission forms, please visit our Forms Center. Samples submitted from outside the U.S. to our U.S. office MUST accompany all the correct paper work including Import, Export and Cites permits. All other samples from outside the U.S. MUST be sent to our office in the United Kingdom ABI-UK."
Senegal Parrot named "Kane"; Yellow-Sided Green Cheek Conure named "Bowie"; Blue Quaker Parrot named "Lita Ford"; Cockatiel named "Duff"; 8 American/English Budgie Hybrids; Ringneck Dove named "Dylan"