Worth keeping bookmark How to create your own dataset with Kirkorov and Face on Yandex.Toloka (russian), at least for referencing CLI googleimagesdownload for downloading images from Google images in command line. Economics is impressive: 1.3$ for classifying 1150 photos. Another similar post Creating dataset for recognizing meters on Yandex.Toloka (russian) describing case which is much closer do my needed for creating data set for ukrainian traffic signs. Author promises follow-up for task for image segmentation for computer vision tasks.

Read post Specialist for labeling data (russian) which browses tools for labeling data. Nothing new.