I will tell you this what I tell to all my other friends, who are sort of new to G+ or wondering how the things work around here. Since is possible for all of us to circle people with out asking for their permission is more easy following their streams or even writing on their profiles with out special invitations. So, get more active!
Start meeting people, not only about your occupation as a graphic designer and illustrator, I'm pretty sure you have many more interests than that.
Write on their pages .. always use tag as +name, so they can "hear" you and not for the last: post interesting articles.
That articles may be related to your profession or something you found interesting around the web.
As I can see you have many artists in your circles as well, why don’t you make one collaborative project .. check out photographers and how supportive they are with each other. :)