>>152469
It's Vampy from the game Granblue Fantasy.

Image source:
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=56669571

How to find it:
www.iqdb.org

If you don't have a Pixiv account (more than likely), a booru site like Gelbooru or Danbooru is fine.

Click on the most likely result, then see the tag list on the left. The character's name is in green, the franchise is in purple.

http://gelbooru.com/index.php?page=post&s=view&id=3158455

To make it even easier on yourself, install 4chanX on your desktop browser. This puts IQDB one click away.

(The previous anon was going to post all this useful info, of course.)

>>152521
How to find it:
- go to >>>/wsr/
- press "[Start a New Thread]
- give it a title like "where is this image from"
- press the "file" button and attach the image
- write somethingin the body that describes what you want to know
- press "post"

Someone will soon reply, telling you where the image is from.

I'm not sure OP needs this guide though: he seems to have it sussed already.

>>152548
The basic idea is to make posts that make sense.