https://learn.microsoft.com/en-us/azure/ai-services/computer-vision/concept-detecting-image- types Image Categorization doesn't identify image as photograph or drawing. https://learn.microsoft.com/en-us/azure/ai-services/computer-vision/concept-categorizing-images Captions are generated using image descriptions in V3.2. However in V4.0 it is image captions. https://learn.microsoft.com/en-us/azure/ai-services/computer-vision/concept-describing-images