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can you tell if the water is comming from the plastic line that goes to the ice maker or does it seem to be comming from the valve ?
The drizzle pattern points back to the hose at the back of the refigerator, at the point where it points to the back of the freezer, icemaker. So, it looks like an exterior problem. My gut tells me to pop it off, but I hate to break stuff unnecessarily. Also, I wonder if there is a blockage. The filter was pretty yucky.
near the top where it goes through into the freezer or down near the bottom ? your ice maker feed tube inside the freezer could be frozen. can you see that ?