Tricia bikini bound

My newly created OC Tricia tied up in a bikini. I did it in pencil then decided to ink it with old fashioned ball-point pen. Drawing if fun!

I originally set out to do a simple standing pose, bent forward at the waist with feet apart and her left hand held up to her forehead, but I couldn't resist adding ropes and a ballgag. Thus, her left arm ends up behind her where you can't see it.

I think I got the proportions of the shoulders and hips better this time but I'm still having trouble with breasts. Her arms are supposed to be behind her back and swining to her right slightly. Feet are separated a little, only having her legs tied above the knees. Either her elbows are too high or her waist is too low, I'm not sure which. But I think I got the size and shape of hands and feet right this time...

Pracitce makes perfect and I'm open to any handy tips.