Sorting & Appearance of image gallery

Hi,
is it possible to re-sort the images in the gallery feature?
Also - I don´t like the black shadows on the left and right side of the images. Isnt there a possiblilty to switch that off/change that?

See example in /blog/berghuette-mieten-die-7-schoensten-gegenden (domain in optional message)

Thanks,
Alex