The Loch Ness monster can't be that big, if it really is an 100ft beast I think there would be more sightings.. It isn't a whale and it isn't a greenland shark because they both can't survive in the Loch.
The water ripple outlinings in the picture of the supposed Loch Ness monster aren't really the size of the beast as ripples get larger/expand until they die out.
Beside Nessie there are other species living in the Loch:
The European Eel, Northern Pike, White Sturgeon, Three-spined stickleback, Brook Lampry, Eurasian Minnow, Atlantic Salmon, Sea Trout, Brown Trout and the Arctic Char.
I really hope it's the real deal but I'm going with an oversized white sturgeon.. They can get to a length of 6m (20ft) and they also live in the Loch. They may get even bigger who knows?!
The White Sturgeon:
White Sturgeon caught in Lake Washington:
Whatever it is.. Let's hope for the best
And if even experts can't say what it is, it has to be a damn good mystery