Its kind of hard to explain, but your leg is coming out from where your loop and the left leg meet. Which isn't wrong, but on yours, it comes up short and makes the letter look top-heavy. Try making the leg start from the loop, that'll bring it out further and give your R more balance. Capeesh?
and yeah, negative space is the space between letters or objects. Bring em closer
Nips - I actually like that. But also check out what skope was saying