Sabata has exposed the problem much better than me. He has hit the jackpot and I was completely wrong indeed. I did my crytic without examining the sprite as a whole. I just looked at some details (chest and shoulders) and updated the eyes according to what I thought that was the perspective line. I feel ashamed because of that. I'll try not to be so fast in the future

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So you're right, their eyes are at the right height (albeit I think that they would look better if you raises their left - our right - eye one pixel

). I suggest you to add some rotation to their eyes. They seems to be drawn in a less tilted perspective (no inclination at all). I don't really know how to explain myself better with my pesky English

. Just look at the green dude drawn by Frolly to match the difference.
Please, check her hip (both sides at the same height) and their shoulders, they look to be out of perspective.
Hope it helps.