What I’ve been doing is as follows (this made sense to me, and may well not be convention):
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Self-spot the frequency and SSTV mode on SOTAwatch.
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Send the image with CQ on it.
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Receive an image from other station with their call and report.
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Send image with my report to other station.
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RX image with confirmation and 73.
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Send image with 73 and SOTA reference.
The sequence is depicted towards the end of this thread: SOTA SSTV