Really cool chainmail Arvin. As you asked a feedback on the rocks. Might just be my opinion but the idea of "handpainted" would be more to the fact that they are naturally painted ;) Maybe if you add some kind of effect of brush strokes that would help. Also some edging breakup would also add.
Started a handpainted style cliff today in Substance Designer today. Should wrap up tomorrow. You can download the sbsar here: http://substance.arvinmoses.com/product/cliff-v-05/ Also got featured on cgchannel! Yay! http://www.cgchannel.com/2015/01/download-five-free-substance-procedural-materials/