I don't focus on aura that much. :)
I know a little.
I mean sometimes I see it.
But more before than now, but
the same field where I see Angels is the one with aura.
I know about thought forms. Every thought have form, and you can see it in aura.
I use to see violet color when somebody thinks something spiritually, I think.
But aura as aura-I had some experiences but long time ago.
And I was leaded trough all levels of aura.
I think it is easyest to see first -etheric level.It is blue. And I think on dogs is green.
There are books that teach that, soo...
I love you, hope this helps a bit