Glen Trool follows a clear mountain loch between green slopes, with pale crags, dark conifers and a high rounded summit beneath scattered white cloud.

A blue loch threads between steep, folded hills, its surface broken into turquoise and deep teal bands. A dense wedge of conifers reaches down the right shore, while pale slabs of exposed stone rise beside grass in the foreground. The central summit holds the horizon with dark gullies and sunlit green flanks beneath broad, wind-shaped clouds.

Glen Trool is presented from a high vantage point that makes the water feel like a route through the uplands. The foreground rock gives the scene a firm edge before the eye travels along the loch towards the rounded mountain. Patches of light across the slopes add movement without disturbing the stillness of the water below.