Cleaning Up Edges on a Graphic

Hi Figam Community!

New user here primarily using Figma for design and social graphics. This might be a very, very beginner query, but I’m looking for a general idea on how to “clean up” or smooth out graphics. For example:

The image above just feels a bit messy — hard corners, unevenness, etc. I want it to feel a little “loose” and cartoonish, but I feel like there are ways to make it feel a little more real and organic.

Any advice? Appreciate you all!