Generate a photo link via Google Photos.
Go to this website or a similar one. Embed Google Photos
Put your Google Pic link in the space at the top of the page and click generate code. It takes a second.
Scroll Down and you will see a Direct Link (URL) has been created.
Use the Direct Link (URL) to put in the about me boxes. Do the same for the profile and the wallpaper. FYI the wallpaper doesn't allow for adjustments so you will have to play with pictures to get what you want.
Hope this helps.