In Words of Radiance, Shallan draws a picture of someone destroying a statue. If attentive, could that person have been aware of being "observed" at the time?
I'm not exactly sure what you're asking. I need more detail of what you're trying to get at here.
I think he's asking if Shalash(???) could have (or did) felt Shallan observing her.
Looking at it again, I realize I'm asking for more clarity than they'd be able to provide. I do understand the question, but at the same time, my answers can can confirm or deny things that are (sometimes false) assumptions underpinning questions. So when we get into something like this, that has to do with mechanics I haven't explained very well yet, I get very hesitant about answering.
So...I'll probably just RAFO this one. For now. Though look for a scene involving Syl where something similar happens, as they are related.
I was being more vague than necessary, specifically to avoid a "you're making assumptions" RAFO. I'll go ahead and detail my thinking then and let you respond as much or as little as you like. I recognize that I'm poking at mechanisms we don't understand yet, so RAFO is pretty likely.
I am working under the belief that Shallan's depiction of Ash is accurate and (likely) immediate. She could have visualized the scene in several ways: by having some portion of her aspect or of Pattern's travel there, by some connection-at-a-distance mechanism, or by "word-of-mouth" relay via (e.g.) spren.
As we've seen elsewhere, savvy and/or powerful people (like I assume the heralds to be) are able to notice when an aspect of someone pops up looking at them. Similarly, they could possibly notice a remote observer through the connection. In both cases, I presume that the degree to which the observer is present determines how noticable the event is. In contrast, the passive reporting through intermediaries in the third option would probably not trigger the sense of being watched. So my question boils down to whether Shallan is projecting part of herself, part of Pattern, or doing something else entirely. And in the back of my mind I'm wondering how much manipulation (or aggression) could take place at the other end of the connection.
If I understand correctly which scene you are referring to, where Kal was noticed, then you are saying that the two events share a mechanism which answers the original question, but still leaves me wondering about what is being projected across Roshar. (That you reference Syl is interesting.)
Here is a follow-up question, hoping that I haven't already talked myself into a corner or out of an answer: The clairvoyant drawings occur at a particularly verdant lait, with plenty of growth/death/circle-of-life happening. In a mechanistic sense, did this location help enable the clairvoyance?
I'll have to RAFO this, as I don't want to get into the mechanics right now.