The depiction shows a fully-haired species with ape-like appearance.
By 1 million years ago, our ancestors were several million years removed from the common ancestor of apes and men.
They likely were as nearly hairless as modern man, especially given the environment.
They also were close to as tall as modern men. We shrank a bit in height when we became a sedentary species and only started growing again in the last couple hundred years, probably due to better nutrition.
[WHO says global figures for males are between 160 and 180cm, and the Lake Turkana boy (1.6myo) dug up by Leakey would have grown to 163-185cm in height, and other limb bones imply similar stature]
From the neck down, there was very little to distinguish adult Homo erectus specimens from the modern form.
When I was a student at the university, we did anthropometric measurements of a large number of Freshmen every year. The school had done that for 50 years and was interested in seeing how humans were changing on a physical level as time went on.
We measured cranial capacities from around 850cc to around 2700cc (modern average is~1150-1450cc, smaller than the Neanderthals). That convinced me that the brain capacity of Homo erectus was more than large enough for speech and culture, though it was likely the brain was still developing in complexity during that period.
So they may have done a connect-the-dots pattern imprint on the stars in the sky, but who knows what stories would have been told about them?