There are two categories of words used in complimenting a woman. These are dirty words and polite words. Some men use the dirty words immediately which is a bit shocking to the point of triggering the FLIGHT response of a person. You do not send a dick pic at the beginning of the conversation. However, words that are polite are only appropriate for a very short period of time. The longer you respect a woman in online dating the sooner the convo will end. My favorite is a combination of dirty and polite words. A French guy talked to me this way. It made me feel like a queen.
I know not all women are the same. But you should test the waters first before taking a dip.