Image embed display problem

I’m experimenting with image embed syntax in the description rather than uploads, which will be limited under the free plan. Using an embed also make it easy to upload from a spreadsheet.
However, I’m finding this results in two problems - first, the image is now under the title and description rather than above, when the image is uploaded. Second, the description line length is longer than picture width. Examples here Clerkenwell Heritage by davidwilcox · MapHub
See Spa Green Estate item for correct display with an uploaded image.
See Smithfield Market for example where I have put the image link above the description. The description line length is still a problem.
Am I doing something wrong?

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