I went back to an app I like because I had used it to texturise images in the past. I’d stopped using it (photodirector) because a lot of the options had changed and I couldn’t find the one that did this (adding wavy patterns to my original artwork). But I had another look and found what I wanted under “art style” I think. You then have varied options to alter the texture and colour. This was my favourite stye. The other thing is you can go back and put it through the same or another texturiser again. So pleased I found it.