Materials: probably oil on canvas. Dimensions: 89.3 x 124.2 cm. Source: http://images.fineartamerica.com/images-medium-large/from-hardanger-johan-fredrik-eckersberg.jpg. I have changed the light, contrast and colors of the original photo.
Materials: oil on canvas laid on board. Dimensions: 64 x 95 cm. Source: http://www.goldenkiteforum.com/gallery/files/1/9/8/7/7/johan_fredrik_eckersberg_1822-1870_-fra_romsdalen.jpg.
Johan Fredrik Eckersberg – private collection. Mennesker i fjellandskap/Figures in a Fjord Landscape (1862)
Materials: oil on canvas. Dimensions: 87.5 x 123.5 cm. Inscriptions: JF Eckersberg/Christiania 1862 (lower left). Source: http://www.sothebys.com/content/dam/stb/lots/L09/L09663/L09663-64-lr-1.jpg. I have changed the contrast of the original photo.
Johan Fredrik Eckersberg – Nasjonalmuseet for kunst, arkitektur og design NG.M.00283. Fra Kviteseid (1868)
Materials: oil on canvas. Dimensions: 38 x 55.5 cm. Nr.: NG.M.00283. Acquisition date: 1877. Source: http://www.digitaltmuseum.no/things/fra-kviteseid-maleri/NMK-B/NG.M.00283?pos=96
Materials: oil on canvas. Dimensions: 39 x 51 cm. Inscriptions: J Eckersberg 1850. On sale by Grev Wedels Plass Kunsthandel, in Oslo, March 10-25, 2012. Source: http://www.gwpa.no/dynamic_image/10396/8958.jpg. P.S. I have changed the contrast of the original photo