I tried weathering for the first time, referencing various YouTube videos. Barbatos definitely looks good with dirt on it.

I experimented with different methods for creating scratches, using sponges and brushes. Ultimately, I found that using a sponge to create large black scratches, then painting over them with silver using a thin brush, worked best.

For the weapons, I initially painted the entire thing with black metallic paint, then added some gunmetal detailing. However, it still looked too toy-like and lacked a sense of weight. After much deliberation, I dry-brushed it with silver, and then added some red rust using weathering powder.

HG Barbatos Frame Painting + Weathering | Behi-mos's Gunpla works