I'm not sure so much practicing helps if fine motor skills are not good enough yet. DD only writes few letters and those are not very clear either. She can write using computer, magnets or blocks so it is just the fine motor part that is missing. When she writes her name the first and last letters are clear to me (probably not for others) and the middle letters have no resemblance of what they should be. I know they practice writing letters in the preschool she will go after turning 3 next summer, I like that there would be something she does not already know
I think she might be only bit above average with her fine motor skills (meaning I know kids who can do what she can).
I just let her draw, color, paint as much she likes (which is a lot) and sometimes she wants to draw letters or numbers then the next day she wants to color princesses...