Purple and gold? Is that a chaos bike or a pimp bike?
Just base coated, but seriously, why is this model so big?! ;( terminator for scale.
Tbh the Citadel brushes are pants in general. They do not hold a point like they should. On a good brush you should be able to do fine detail with a sharp point on a 1 or even 2. The extra volume also makes holding wet paint easier as small brushes dry out faster.
get new brushes and keep practicing. On the chips try a darker colour opposite the highlight to act as shadow too.