Dear PhilC,
First of all my compliments for the painting of your elephant and riders.
I think you are right, Alexander probably did not use these elephants against the Persians, but recruited the Indian mahouts in Perisan service after the battle of Gaugamela against the armies of Indian kings (in modern day Pakistan) and thats probably what the HAT company had in mind when designing these.
I also like your base (no not the plastic one of the elephant but the whole tabletop): A neutral earth base color, on top of that different colors and structures of grass and turf. I can't see what this is. Is it just temporary scattered material? Or glued to the tabletop or cloth? What is so good about all of this is the figures have the brightest colors, while your landscape has only soft, earth colors and greens. So now the figures take all the attention, the landscape is just supporting that as a background.
PhilC wrote:By the way, you will notice that I didn't add any decorative paintings on the elephants, because I don't know whether it was a practice at the time of Poros and Alexander.
Before we ask ourselves if elephants where painted, we must ask ourselves: what are HAT's Indian figures (and so their Macedonian elephants) based upon? I believe all those sets were based on the reliefs that are still visible on the highly decorated Sanchi Stupa gates. The stupa itself is from the 3thC. BC but the gates are later, probably 2nd or 1st c. BC. Also its located in central India, and not near Pakistan at all.
https://en.wikipedia.org/wiki/SanchiThat means 1000km away from where Alexander was, and also some centuries after that moment. If this is correct we should look at all of these Indian HAT figures as probables, possibles and related cultures. If we accept this 'freedom' of historical correctness, that should count for the painting of the elephants too.
Peter Conolly already gave King Porus' elephants some colored paint in his 1970's paintings. Thats no prove.
But all primitive peoples have always painted themselves, their caves and their mounts so the more early, the more probable it is in my opinion wether or not those elephants were painted by their mahouts. So I searched for modern day decoration patterns, focussed on white (chalk) and took out all the chemical, screaming colors that modern mahouts like to use.