Hi Valzed! I saw you shut down your art thread and just wanted to give you my thoughts.
Sometimes no matter how good or bad your art is, it might not get attention, I've had my best pieces (in my own opinion) get completely ignored anywhere I've posted them, the only thing I've ever drawn that ever got any attention is literally the ugliest thing I ever drew.
Basically, attention on the internet isn't an indicator of skill at all. If you're selling icons, well it doesn't mean no one wants your icons, it might just mean they really like their current icon. Like.... I don't think I'll ever change my icon for example... I just like it too much !
Also as dedenne said, it really shouldn't make your hands hurt, I've gotten carpal tunnel from drawing before, if it's hurting it means you need to take a break!