This is totally the opposite of Sargent, and the style I prefer, but I am working on a large project painted on oak panel after the style of Hieronymus Bosch (16th Century Dutch). I have a deadline to submit photo so I will have a little time to allow it to dry after I submit the photo. However, I would like to introduce a bit of cracking. I assume being in a hurry might be an asset for that. I guess there are lots of ways to go about producing cracks, but I would like them to be subtle. Any safe way to get small cracks in the painting?