If the green of the snake was changed to a super dark almost obsidion green and the purple of the mountain was a hue almost as dark as the snake to match, it would be closer to the feel of filmation, dark and foreboding.
The second reason, is that the snake head on the Icon statue is way too small and unimposing. The Head is the equivalent to the Skull Facade on Grayskull, it is the focal point and should be what draws the attention of your eye. It should not draw ANY inspiration from the vintage snake head, as that thing was very poorly executed. It should look like this.
It should be at least large enough to place a figure in its jaws.
Besides those two issues with tthe icon design, the other issue is the size/cost issue. If you were to include the side that does not have the snake, it would double the cost. It is a great way to get the vintage face on the playset, but I would prefer they just made the snake coiled mountain portion, and then made a hole on the side facing away from the snake head that a waterfall or even the vintage snake mountain could just slide into. The hole would be a great way to be able to access the inside of the mountain when it is folded closed. Just make the snake coiled side, slide in your vintage Snake mountain, like this.
This will save on cost and shipping. If you leave a place to slide in things, later 3rd party or first party add-ons could be made, waterfall, smaller spiked mountain, etc.