Quite difficult to plan a series of photos of shop fronts in Lerwick due to the narrowness of Commercial Street. The Shetland Times Bookshop is probably at its widest point so a good place to start. A good bookshop it is as well - not as big as Waterstones and the like - with a good selection of relevant wildlife and local books
I know what you mean having been there, but a good challenge for you. You should put up a picture of the Christmas tree lighting that has caused many a comment from the Shetlanders on facebook, lol.