I am currently writing my masters thesis. I include in it a screenshot of a webpage, in which I want to point at some components and explain what each of them does. What I did so far is that I draw circles around the components and an arrow from the component to a one word text saying what it is, I intend to go into details under the image.
Is that sort of “labeling” formal enough for a thesis figure? Or is there another presentation that would be more appropriate?