You will need to exclude the image in the first child word of the div , and not just about the first child element of img , since each img is the first and only child of its div , and the div elements themselves are siblings.
For this you can use this selector:
.entry-content div + div img
This selects the image in each div that appears immediately after the other div , so your first one will not be matched.
If you have siblings other than a div inside .entry-content , you may need to use a common selector instead:
.entry-content div ~ div img
Boltclock
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