any idea why this was rejected please. I was using a new Tamaron lens and wonder about the quality

Even on that small preview, I can see an exposure problem. I think the picture is unerdexposed, and may also missing contrast. As for all other technical problem that you may have in your file we will need a better resolution.

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

Thanks, it was soft. 

Adobe told you why it was rejected, what did they say? Also, we can't tell anything from a tiny picture, please share the exact file you submitted (not one resaved or remade).