@NickRowler
I would maybe use a bit less space between the characters, like this, they are very far apart and also don't really intrigue me because their relationship might look interesting. They both look rather unhappy, so something like an embrace might work for mutual comfort (I haven't read the comic so idk if it works for those characters)?
The icon has very little space as it is because 300x300 px isn't big, so make the most of it, especially with such a simple background!
I actually really liked your very first icon where they stand back on back and have this side-glance at each other, through which they kind of interact with each other and create a dynamic, there I just would change the angle a bit to make it look more interesting, like slightly from above. There are so many icons that show us something frontal, so be creative!
And if hugs don't do it right now, moving them closer together and zooming in, or copying the old icon (the one I mentioned) but with their sad expressions, might have a nice twist to it, too.
I hope this helps!
