I'd heard of Metroid before and know of Samus, but I've never seen that thing before. Is that what an actual metroid is? It does make me think of some sort of poring abomination.
I take it your creation is inspired-by-metroid rather than meant to be a direct conversion to pixel art because of structural differences (the, uh, beak?) but you could still try and highlight the, er, grape-bunch-brains as individual balls perhaps, lighting top left of each ball rather than split both sides might work better, similar to how it works on the outer jelly-like shell, or on Jad's poring itself.