I think April looks pretty good there, not just compared to the shaded ver, but to her previous expressions.
Otherwise, I don't know where the very bright contrasty yellow highlights come from or what you're going for there
but they seem to be way too much.. in bot saturation and intensity.
This seems less visually agressive, but..
.. but I think if you brought the visual quality at the same level as some of your modeling (like the turtles, the big sphere/drill base model and other things) it would be really cool!
And I think it's just a question of putting as much attention/patience and "getting new skills" as what involved modeling those things, but on a shading/rendering level.
(meaning I know you can ;) )
And you could also further study/scruitize/observe subtleties of the "feel" of references that you like to further refine the overall look.
I think you should concentrate on making a just a few good ones as best you can, like prototypes, and only then apply tweaks more in mass.
Also I included a shot on how to map the glow pic, you can just apply a sprite shader to the grid, create an "XZ" projection from the "image" node, and plug that to the color and alpha of the sprite node.
Cheers!
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