For me personally I think, that Nal being depicted alongside the enemy adds to the perception of these as scenes and not just enemy images, if that makes sense.
It didn't bother me much, that it was only one image and I think that adding more is by far not the most important thing.
And even when we come to that, I'd consider adding one or two alternate versions (e.g. for each mental state) which would be the same across every fight might already be enough. The images for the grapple states could be enlarged regardless.
I can see that it could warrent more in the future (different equipment, or other player statuses), though I wouldn't say that not having these alterations would detract from my experience very much. But that's just my opinion and I don't know how well it reflects others game experience.