More my members have had some complaints that default personal photo pixs 150x150 is pretty little. Yes, I can set up much more pixs but then profile's layout could be broken.

Then suggestion - there could be two dimensions - little (150x150) - thumbnail as photo in profile, and when you click on photo You get second dimension - big (for example 600x600) as popup. Like in Gallery.

So long as 600x600 is the max and isn't scaled up to fit (shrunk to fit is okay), then I'm for it.