An important Upper Palaeolithic cave in Spain where artists used exaggeration of proportion when painting a deer is:

The correct answer to this open question is the following.

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An important Upper Palaeolithic cave in Spain where artists used exaggeration of proportion when painting a deer is Lascaux.

Lascaux is located in Montignac, France, in the southwestern part of the country. In this region, archeologists have found a series of caves with many wall and ceiling paintings inside caves. Mostly all the paintings are of large animals.

Spain and France are home to some of the most famous pictographs.

Ancient paintings located in caves in many parts of the world are known as pictographs. Other similar pieces of work are the petroglyphs. Archeologists differentiae both in that the petroglyphs are rock carvings or etchings, meanwhile, pictographs are rock paintings.