The first image is a stable sketch because the only figure in this image is the dots on the top, bottom, left and two in the right. For some, people think that it’s a Ambiguous image because the dots are moving around at different directions but I say it’s still stable because the dots are just very calm and just staying in one position to another. The second image is a ambiguous sketch because we see this very large object on the top right corner that doesn’t show where it starts or ends. It just crosses the whole image on a side. Unfortunately, I do not have the original picture that is only draw with black market because I’ve already hand it out the original picture to the professor and that is because I’m only showing the sketch version.
Update (October 11, 2018):
The two images on the top are the complete and ink figures.