Those images look pretty OK to me - perhaps just edging slightly towards oversharpened. Not sure what your sharpening technique is but if you've got PS then I can recommend a free script called Web Sharpener for sharpening images for web viewing - http://www.andreasresch.at/2013/04/07/web-sharpener-better-sharpening-for-the-web/
Very easy to use and it allows a lot more control than something like Lightroom's default export sharpening or simple USM (for example, it splits highlight and shadow sharpening into seperate layers so that you can adjust the opacity of each separately, along with seperate layers for contrast and saturation compensation).
The differences can be quite subtle but its better at preserving shadow details and compensating for loss of micro contrast when downsizing.
As an example on a slightly soft long exposure using mildly tweaked Web Sharpener settings vs Lightroom 5.2 web export defaults (click the image for proper comparison, the forum shrinks them a bit) -
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