I did ^^ He was really happy, so both me and him say Thanks ;)

You guessed right ;)
I should tell you his thanks for your feedback, he added that it was motivating as hell ^^

I asked him about uploading and he told me following:
"Uploading on a furry community? I think I'll leave uploading and this stuff to you ;) I'm not drawing to get attention, I do it for the joy seeing the finished work. I'll send you pics from to time to time so that I get this pretty constructive feedback."

Well very well if that is the way he likes it I will respect his and your decision hope to see more art from him and you soon.
An if you has a friend has a signature he should put it on his art pieces.

I'll let you know if you want, when he sends me another picture.

I noticed that it was missing, I'll definetely ask him about that tomoroow ^^

That is fine I am watching you and if you want to make it specific then you can note me, or I will just read the description, I thank you though.