Hi Sharon,
Here is #113, #114, #115 as my work update.
I try to made them look like the attachment. However I should avoid them too close to image attached, since the image is not belong to you.
On my opinion, coffee stain may hard to look natural when it present on black color only. Naturally, coffee stain appear on difference color tone between its edge and its center part. I try to present this opinion in entry #115, where I made its center part a little bit brighter then its edge.
Otherway, adding one two splatter around the coffee stain may help to make it look more natural, even this potentially make the image a bit messy.
I hope my explanation above can help, thank you.
Regards,
Bauhaus