I'm sorry it takes me so long to answer you, but here is that pattern. Unfortunately I cannot credit it properly as I found it really long time ago. Before applying this pattern on my picture I sliced it into pieces and transformed some of these to make it more cohesive and believable.
Sure, not a problem. If you want to apply a texture or a pattern on something in Photoshop you can use different blending options for layers. You just need to have original picture on one layer and a texture you want to apply on another layer (that layer should be above the layer with original picture). If you look closely you will find, that by default both layers have "normal" blending option enabled. Try changing blending option for the layer with a texture from "normal" to "overlay" and see what happens. After that you can adjust texture however you want (eg. change colour, make it brighter, transform it to fit certain perspective and so much more!). Also you can adjust opacity of the texture layer to make it subtle.
It's not only overlay blending mode that allows to use textures this way, other blending options can give you interesting results as well. Also these blending modes can be used for a lot of useful tricks as well.
I hope this is what you were asking about.
I'm sorry, I couldn't provide you with screenshots but it shouldn't be hard to find a handful of videos on this topic. Look for some information about blending modes, experiment with those yourself, have fun doing so. Wish you luck
I'm sure there should be one! I was commissioned to do this illustration based on the description of two characters. One is Oscar and another one is OC created by Celina (there is the link to Tumblr page in the description of this piece). Unfortunately, I don't know whether the story behind the Lady (OC) is available somewhere .__.