yeah it’s fine
look at the rules

You may use any stickfigure(s) on the website. Obviously using “better” stickfigures will make your art look better. Due to this, your entry must contain a considerable amount of work on your end and not rely on just placing a couple of someone else’s very-well-made figures on the stage and calling it a day. This will be judged on a case-by-case basis.