Finding a key in a dungeon, in this case a very old and decrepit dungeon, usually means there is a door/container/object that the key can be used for nearby. However, when one doesn't have a map, and the key in of itself doesn't have many clues to what, or where, it is used, can be a problem. Add to that the threat of monsters, guards, traps, and whatever else one may come across to be a danger in these sorts of places, that can quickly make things even worse.

I originally started this picture as a random doodle during a conversation, but ended up taking a reference photo and trying to make the sketch into something more substantial. From there I played around more with the pose and after a good bit of a struggle, I actually managed to make the pose contain a full body for once.
I was not sure what she was going to have in her hands for a long time, and had been bouncing around ideas for a possible background, or no background at all. When I did decide to make a background, I was already working in Photoshop coloring the character. I'm not very good with creating line art in PS so I tried to make a few things using just colors. Even with  vdisco 's help, I could not get the results the way I wanted.
So in the end I decided to go back to Manga Studio and start an independent background that I would try to import into PS behind the original picture. I did use a reference drawing to help me create a good dungeon sort of background though. The actual background drawing I made is much bigger, but I think the current position worked out well enough. That and it also gave me a lot less to color in the end, hehheh.
I tried to make her not stand out too much from the background, though to an extent I still feel like she looks like she has just been placed on top of a backdrop. Though I don't think it is incredibly obvious. When I tried to make her blend into the background even more, her colors got to be too dark for the image I was trying to create.
I know the anatomy is a bit off, as well as the perspective, but I feel like the picture came out well enough that I can let it slide. But in the future, I will need to be more aware of such mistakes.

I have to give credit to  vdisco for help with various parts of the anatomy, the pose, and help trying to make a background in PS when I was trying it that way, and to  farx for tips throughout, including trying to figure out what she was holding and what to do with the legs.

I hope you all enjoy it, I know it's been a few days since my last submission.

Edit: Thanks to a comment, I was reminded that the key she's holding is supposed to be a mock of the Legend of Zelda Boss Key. In the midst of writing everything else down, forgot to mention that. Kudos for those that recognized it though.