How to cite self-created images or pictures in thesis When we put some images in a thesis, we provide a reference to its source where it’s located. If I have created my own images or pictures, how do I make it clear that they are my images and I did not copy and paste them from somewhere?.
So here is the scenario. I am comparing my application architecture with the existing architecture. Since it was a literature study, my architecture is quite different except for one or two components that share the idea with the other one.  I am showing both architectures. I explicitly mention the source of the other. But what about my own?
Is there a need to cite self-created images? If yes then how to cite them?
There is no need to cite self-created, previously-unpublished images any more than you need to cite self-written, previously unpublished words.  By absence of a citation you are claiming the work as your own.
Since this is for a thesis, you should probably check with your advisor / supervisor to be absolutely certain they share that view.