Maybe one problem is that he looks down. From many of those refs, stretching lions look up.
This would make you redraw the head, but might help you connect it since you would then show more body.
The big head doesn't make it easy, but it's sure worth trying.
I'd suggest to look for cartoon lions too, to see how artists overcome the difficulty of exaggerated proportions.
Colors: the new greyish yellow works weirdly, because it is between 2 more saturated colors in the ramp.
I also think the new dark brown, at least, is unnecessary.
I like it that the shadows are blueish. It's a globally interesting palette, just needs a little fixing.