Thanks everyone, it means a lot! And thanks for taking the time @edenriquebq! No need to be sorry, it does raise a good point
Small wall of text:
I'll defenitely play some more with enemy placement (more in line with adding something to the left?). I was going for a good old triangle shape with the composition and thus kinda need/want the villain to be centerpiece (and have all the flow lines leading the eye to her upper body/head). If the focus moves between the characters, I feel like it would translate in a more 'even fight', which it certainly isn't Then again, I will try moving it a bit as an experiment.
And as for the content-aware filter giving out more guys (hey, Christmas is early :D) - I'd rather not place any more enemies on the right, as it might get super crowded and visually heavy, even with a stretch in the canvas.