I have come across very few early images of Highland inns - the General's Hut for example. But once the tourists started coming in greater numbers, and the quality of hotels improved, photographs and postcards became much more prevalent. Any hotel worth its salt was keen for customers to send off images of where they were staying, hopefully saying "this is a lovely hotel"! I offer here some photos, mainly late 19th/early 20th century images of hotels, especially those further to the north.
You may need to click on an photo to see the full image if it seems cropped, and also to the later examples I have added since I left Simplesite for one.com website compilers.