Adobe has a free extension for Photoshop called Adobe Paper Texture Pro. With a single click you can randomly apply two Flypaper Textures (included) to your image. If you do not like the result, simply click again for a different result. Click on this link to learn more: http://blogs.adobe.com/cssdk/2013/02/adobe-creative-cloud-exclusive-and-free-adobe-paper-textures-pro.html. Let's apply this extension to this image of Andrelica:
After a few clicks, the extension came up with two interesting textures. The first one is called Danielli, and is in Overlay blend mode:
The second texture added is Brushed Rose, and is also in Overlay blend mode:
The effect was quite warm, so I applied Photoshop's Cooling Filter (80) and set its Density to 53%:
A custom vignette was added to give the image more of the look of an old masters painting:
To make the image look even more like an old painting, the Darken/Lighten Center filter in Nik Color Efex Pro 4 was used to light her face and further darken the edges. A control point was placed on Andrelica's cheek to mark the center of the effect. Here is the final result:
This is a quick and fun way to apply textures to an image. Often, it will apply textures you would never consider using. Moreover, it automatically resizes the textures to fit your image, and is therefore extremely quick compared to manually adding textures. Further, you can use your own textures if you would like. This extension is definitely worth a try!