I like the second banner more. A bit of an improvement compared to the monotone nature of your other tags. But I think the lighting needs work. Spam more dodge and burn tool, man! XD; As for the first tag, the render has blended nicely and I like that. But the lighting's messed up here as well because there isn't really one single light source. You probably went a little overboard with the effects as well, imo. Keep it down a bit because the render is being overwhelmed by the sheer amount of effects in there, as I see it.
I could totally do that if I remembered where I got them from. :c But unfortunately, I've gathered stuff from various sites. Quite a lot from deviantart. So I don't really have any link, per se. But I definitely plan to upload my resources sometime soon. When I do, I'll link you.
I'm a member of quite a few graphic forums. If I want criticism, I just post in those. Not really interested in joining another atm, sorry. Maybe sometime in future.