When one eye was watch and the other was tendril, the watch eye looked
a little like this. When Adrian asserted control both eyes were briefly watch. I think the freaky green eyes implied Erin was doing what Erin knew she had to do.
Obviously we can't know what the current eyes signify, but it seems possible to me that they simply represent Erin being happy to be under Adrian's control. I don't think they necessarily indicate that there's something wrong. But they may do. There's still the question of what Erin took from Cherry in 847.
On an unrelated topic, I'd be interested in why Mallory thought they were in Jakob's mind while in the cloud.
More than that, she said they were in his skull. I have a feeling we're not going to get an explanation of the nature of The Cloud that will stand up to scientific scrutiny. My take on it is that The Cloud had some connection to Cherry's mind (through the monster she unleashed). So Jakob's influence on her mind was also present in The Cloud.