Lovely drawing, hun~!
I love how your putting more than one character together and trying different poses
very daring~
So, to help you with the girl's pose, I did a quick blue line for you (because your drawing's in red
xd )
then then showed how her clothes would then fit on

So, this is just a quick idea pose, you can change it however you'd like
only, the things that need to stay too make it look like she's hanging on his arm, is to have her upper body protruding forward slightly because he is so much taller than her, he would end up draging her a little.
Alos, I think the dude's head is a little small, especially compared to his shoulder width and the girl's head, so you might want to look at that
The clothing designs are awesome, hun~
I tried to recreate it on the girl, but I'm not sure how well that turned out XD
Also, I have the girl looking at the dude, because in my opinion it makes it look more like they're interacting.