What I do not like with the method above are the black stripes at top and buttom and the arrows left and right. This distracts from the image.
As far as I remember, there is more than one way to embed from Flickr, and there seems to be one possibility so the image from Flick appears as a single image, bigger and without the arrows and without landing at flickr directly. But I lost atm a little bit the overview
A critical point IMHO is, that we find a solution that works also on a smartphone.
Is there any other way for you on a smartphone, that the embedded image shows bigger here (in Pixel) and only that image, not the gallery?