How should I be lifting for sleek arms? (Female)

I want sleek SMALL arms. I undertand you can't target a certain zone for weight loss but I'm dieting and working out so losing fat all over. I've seen my arms lose some fat and I'm happy with that. I do cardio at least 4x a week and weight training 3x a week.

At the gym I always see 2 types of for girls.
Type A is very thin but has muscle definition in her arms and legs and it's looks like the kind of body I want.
Type B is also noticeably fit but a little thicker but NOT FAT. Stomach is flat and all the she just looks a tad bulkier and her arms a little bigger than id like.
I see both types using weights but don't pay enough attention to know there workout.
I do not want a bulkier figure but more of a sleek figure with muscle definition. How do I achieve this?

My usual routine is 3 different bicep exercises and 3 different tricep exercises
3 sets each. 12-15 reps. Once I get to 20 reps each set with no problem I go up in weights
Is that okay or should I do more reps? I get bored with too many.
Any advice appreciated
Thanks

Replies