I've seen people mention that, and I even checked it out myself in my copy of AS, but yeah, it's just a palm tree. It might be a hint at Sun & Moon, but who knows.
Well, now that the Meowth and Marowak flood is subsiding, it's time to get back to the thoerizing:
Arbok: Typically, Arbok frighten any would be adversaries with their fearsome belly markings, and this held true in Alola for several years. However, when Gumshoos was introduced to the region, it was undeterred by this normally intimidating display, and it and Yungoos tore through the Arbok population of Melemele Island. This led to Alolan Arbok adapting means to outwit its newfound predators, notably a tear away tail it can detach at will should an enemy bite down on it. This loss of limb is no big deal to Arbok, as it can regrow its tail overnight.
Type: Poison/Dark
Ability: Infiltrator/Regenerator
Hidden Ability: Rattled
HP: 60
ATK: 85
DEF: 59
SPA: 40
SPD: 79
SPE: 115
And now the sketch
https://drive.google.com/file/d/0B9ubJh8cUutBT0VmU3NPNDRQWU0/view?usp=sharing