Which picture should I use for supporting that my hypothesis was not supported? And please make a good explanation of the picture you have chosen

You should probably use the third picture to support that your hypothesis was incorrect.

Explanation:

I do not know what your project was, but it seems as though you were able to gather that the state of matter is liquid throughout the experiemnt using the last picture. If your hypothesis was that the state of matter would change, then the third picture would show that this is wrong, as it remains in a liquid state.

a physical change is being made.