Matsya Purana 260.36

260.36

tathā trivikramaṃ vakṣye brahmāṇḍakramaṇolbaṇam.
pādapārśve tathā bāhumupariṣṭāt prakalpayet .. 260.36

Now about the Vâmana form of the Lord striding the three worlds, as if pervading all the Universe. The upper portion of the image of Vâmana should be made with arms by the side of His legs raised upwards, and the form of Vamana holding a goblet in the left hand and a small umbrella in the right. This is to be represented in the lower part of the figure. The face of the Lord should be extremely meek and appealing.—36-37