Thank you Joern and Steve for mentioning the wing pattern. When I saw these pictures, I considered these not good to judge pattern and iriscedent colours. But you are right, after reading your comments, I looked at these pictures again and see a wing that is better for Teal. Thanks for that.
In quest to improve my own really bad pictures, and having more spare time the next days, I tried to look more closely at image editing programms and play with them. And I considered this dark underexposed picture a good example for me to play wit the "brighten up" and "contrast-level" buttons and learn for myself. For this post, I duplicated a result here, just brightend up and added slight contrast/sharpening in order to achieve a better, more neutral look at this duck. Appearantly not a good idea, see the result here:
a contrasting duck with a contrasting head pattern, with a pale loral area better for Gargeney, as was appearent warm buffish-orange colours so good for 1 cy Garganey (when taken image altering into account, I thought).
And while I agree with you Steve, that most adult female and many 1 cy Gargeney have a pale, many times even whitish throat, I have seen some 1 cy Garganeys that lack this feature (and my picture altering produced a pale throat, but this seems further down than the real thing)
I promise not to do this again and leave altering pictures to smarter people.
I hope the OP doesnt mind. If so, I will delete it ASAP.
And more: hoping to learn I hoping for more comments regarding shape and position of the white horizontal stripe near the tail and the bill-shape.