Where can I show my work online? I started drawing and would like to post my work on a website, without having to make my own blog. I'm looking for a kind of "social network for images".

I tried the most popular images social network, Instagram, but it is absolutely not what I'm looking for. Maybe it is good for photos of your food, but for drawings I think it is quite awful (upload only from phone, squared images...).

I mainly think about Tumblr, but it is not as famous as Instagram, and not really handy too... Imgur is a different concept.

What are the main/popular websites or community for sharing art? 
I want: 


easy upload
easy sharing
easy commenting
(possibly uploading directly from the phone)


Thank for your time and advices,
Cheers!
You could try www.deviantart.com . I never used it but it seems like it's a website for artists to easily show their work. I think it is even possible to sell prints of your art.