Excellent! You are a great artist!
Keep doing works like this, the color, poses and background, everything is great.
XD ^^ Well, it certainly makes your artwork stand out from the superhero crowd!
Tumblr is just another micro-blogging platform, like Twitter. It's actually very good since it's currently one of the most popular social networks. So having your work featured (or starting your own tumblr) will generate more traffic to your deviantART. The Batman Blog is just another fan sharing Batman works, both official and fan-made. They did credit you by name with a link back, so I wouldn't be too upset.
well.. because you say that.... I'll draw only faceeees!!! *joke*
Thank you for comment~!