I like the ideas of you @blueorgy but all sites you created doesn't work for some reasons, no offense.. I am her since 3 houres trying to get a profile picture - 1000x1000px png, less than 1mb big and it doesn't work.. I am frustrated now about steemit :-(

EDIT: Yeyy I finally got it. PNG, 1000x1000 px, transparent background (you can cut it out with gimp that you can toggle to night mode), at last postimage.org works - i used the direct link. Upload without changing settings. thanks @primus for the great link!