His brutally naturalistic renderings that were deemed unsuitable for religious subjects.
The part of Caravaggio's painting technique that was frequently seen as improper for religious topics and occasionally perceived as conflicting with the aesthetic standards established by the Council of Trent, an ecumenical council of the Catholic Church, was the brutally lifelike depictions.
Use of light and shadow: Caravaggio's dramatic use of tenebrism, or the sharp contrast of light and dark, was one of the key elements of his painting.
He frequently placed his subjects in vague, sparse, or gloomy environments and used dramatic lighting to increase the emotional impact of the image.
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