For the painting of worn leather accessories such as belts, cartridge belts and others, I divide the process into 3 main steps: base painting, texturing of the wear, final tone according to the type of leather (brown, black, etc) using oils and outlining.
In this case, the photos correspond to cartidge belts of the Spanish army from the beginning of the 20th century, made of black tanned leather. The colors used can be changed to achieve other shades of leather.
Step 1: Base Paint
I used Shmicke's yellow ocher and applied it all over the leather, not worrying at this point about lighting or final wear.
Step 2 – Texturing the Wear
Before applying the final tone of the leather, it will be necessary to apply the texture of wear that we want to give to the leather. To do this, I used Vallejo's red leather color, applied with small stripes from the center to the outside of the straps, leaving the ocher color visible on the edges and in those areas where we want to simulate more wear. It is important that they are irregular stripes.
At this point we must obtain the general pattern of wear and a tone on which to apply the colors of the last step with oils, taking advantage of their transparency to achieve a realistic final effect.
Step3: final color – oils – outline
For this example I used 3 colors in two applications. The first phase is with a mixture of burnt sienna and raw sienna, which gives us a dark brown leather tone. I apply the paint from the center and the darkest areas of the leather and it blends towards the edges and areas of more wear. This effect will dye all the leather but revealing the previous texture. It is important not to apply a lot of paint at once and go little by little so as not to completely hide the previous step.
If we want a black leather, as in this case, we repeat the previous step adding black to the previous mixture, applying it in the same areas but reducing the amount of paint somewhat and blurring the effect according to our preferences.
Achieved the final tone, the last step is to outline the edges, first with a sand or beige color to highlight the wear in the most exposed areas (it is important that the paint from the previous step is dry and apply it in small stripes in order to not overdo this effect) and then outline the line where the leather is separated from the shirt, to obtain a cleaner and more defined result.