Réponse :
1)One feels nostalgia in the canvases of Bierstadt and Dixon.
2)We really sense that these three artists are fascinated by the American West.
3)To contemplate these canvases is to experience the pioneering spirit of the frontier. OU To contemplate these canvases is to feel the pioneering spirit of the frontier
4) I can almost smell the grass from the plains.
Explications :
Bonjour voilà j'espère t'avoir aider et pour les 3 premiers en anglais tu peux utiliser feel