I'm not going to pretend this is a small task either; certainly none of us here can claim to have accomplished it. it's the realm of masters. still, it's what we all have to try for.
The fadatars are generally 50% of the size you're using, then blown up 200%. Take a look through the fadatar gallery. Also, try working with the fadatar palette that most people have used - it's a good restriction, you'll learn a lot by working within it.