THe second sentence is using present participle because you said " I promise" not "promised". Saying promise is when you are saying it at the time and saying promised means you've already said it. Like with how you said "kissed" instead of "kiss" in the first sentence.
The selection of medium (written version vs. visual image) mostly affects the understanding of a theme. This is because the creator could create a detailed explanation using written medium but not with the visual image medium<span>. But, it all depends on the readers' knowledge to interpret the medium itself.</span>