Lovely shots Abby.
Not sure what you mean by not sharp, they look OK to me, two look washed out which I tool to due to back-lighting flare possibly. You can probably fix this by adjusting the black point and contrast a bit (before conversion to JPEG).
Are you resizing your images yourself with the "bicubic sharper" method, you can loose sharpness if you let a web tool do it.
Like this...
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