Jan- It looks like you changed your avatar pic to one with a seascape in the background. I also have an iPhone 6+ and I just uploaded a new avatar pic and there was no problem doing this. This one is similar to my last avatar (same original pink Margaritaville "It's 5 OClock Somewhere" T shirt and black shorts), but a different shot taken on the same day on Mulberry Street in NYC.
Poucho- You have to hit the "update settings" box after you upload the pic otherwise it will not save your changes. It's very simple to do with the IPhone. No reason to email the pics elsewhere- just upload it straight from your Photo Library.