There's honestly no way to give an answer for this post. The first photo does indeed look like a lens obstruction of some sort.
The second one could be an obstruction of the flash.
I'm not saying that is what it is, but both effects can be reproduced by obstructing the operating procedure of the camera.
It could be a shadow entity, but we need conclusive proof. Something that cannot be duplicated using normal means.
Everything else will be argued back and forth between those who are convinced that it was indeed a shadow person, and those who are convinced it's not. In the end you'll be right back at square one.
If spirit activity is indeed occurring in your house, it should still be there I presume. I suggest trying to capture any type of phenomena possible.
Including EVP's, photo's from several different types of cameras, or maybe even supervised and protected use of a ouija board.
If the phenomena is there, you'll eventually find more substantial evidence. Just keep trying, use a lot of prayer, and be careful.