[sheept]

That's interesting. I think the bikes-facing-left bias probably comes from how humans use bikes: the kickstand is on the left, so people likely hold and approach bikes from its left.

Looking online, the kickstand is apparently on the left to avoid the gears. Based on the other comment about bike photography, it's interesting the same design choice makes humans and cameras/LLMs see bikes from different sides.

[OliverGuy]

If you are a bike nerd and like taking photos of your bike(s) you'll almost always try and have it drive train towards the camera, which would be front on the right side. Possibly this is where is this coming from? Generally also true for retail listings too

[Sharlin]

I think in general if you ask people to draw vehicles or animals (including humans) from the side, there will be this left-facing bias. Perhaps this is true only in left-to-right writing cultures, hard to say.

[amelius]

It's the other way around: the kickstand is on the left because people jump on their bikes by swinging their right leg. Therefore looking at a bike from the other side feels awkward because you don't feel the same urge to jump on it and ride it.