Change the size and shape of Avatar

Can you explain what you actually changed?

I changed 68 to 200 on lines 86,119 and 122 of the User Banner Content. Also made the same change on line 7 of avatar.vm.

Also changed the Change User Avatar Modal Content (line 58) - changed 64 to 200.

Even when changing the physical size of the image on the lines you mentioned in the User Banner widget, there are CSS rules that also affect the size of the image.

Specifically, the avatar wrapper is set to 68px and img tags, in general, have a max-width of 100% -- these two rules alone will keep the avatar rendered at 68px. 

You'll need to adjust the theme's banner styling to allow for a larger avatar. Note, however, that these rules are used for the user banner and group banner widgets, so, changes made to support larger images on the user banner should also be reviewed in the group banner.