Macca again, this time I'm here with part 2 of my spartan WIP for my White Scars. First off the bat, we have the left side of the tank. You can see here that the decal for the White Scars has been placed central on the door. It has then been varnished to keep it on the tank, then sponged gently with white, not too much, or else it will be too diluted. This gives it the appearance of damage and chipping. Note that the door frame is chipped all around, to do this well, you need to do the door separate to the rest of the tank, or else you will smear the paint and it won't look right.
This is the left side sponson shroud. Again, it has been chipped at, all with a sponge. The idea here is that only the edges of panels are chipped. People often make the mistake of chipping a flat surface, this isn't how it works in real life, and it doesn't look right. Do a web search for battle damage and you'll see how far some go. That's not to say don't do it if it suits you, just be mindful that it isn't realistic.
The right side is much the same, a little more damaged, for no other reason then to keep the tank from having too much symmetry. I have used a heavily diluted oil wash, again, my mix of green, brown and black, to create my 'grease', I have then gone and put it on every rivet and into most panel lines. This helps to define the shape of the tank, as well as breaking up the plain white. There is one really important point to note here, and that is DON'T WASH THE WHOLE TANK! This is again, something the internet is very bad for in tutorials and the like. Doing that will actually blend the wash into the panels, meaning all you're doing is making the whole tank darker, rather then creating contrast. Also, it leaves big dribble marks often.