The relief heads are located in narrow ornamental panels above various second and third storey windows, four on Cambridge Street and three on Sauchiehall Street. All but one are idealised representations of allegorical types, including a cherub, a monarch, and a female deity with a floral crown. The exception is the male mask above the second floor window, two bays from the corner on Cambridge Street, which is a portrait of the architect, James Thomson. Other carved details include a square panel containing a Latin cross enclosed by a label in the form of a knotted rope sited two floors above the portrait; a small triangular panel in the attic above this containing the monogram 'IO' (?) in entwined letters; a large panel with an armorial crosslet held by a gauntlet with a large cherub mask below the Sauchiehall Street attic; a miscellany of cherub and lion masks, thistles, shamrocks and crosses above the attic windows on both frontages.