To Konnoc:
Yes, all of the ships you mentioned started with a black primer base and were worked up. The process I follow varies slightly from model to model depending on what I am trying to achieve, but I will try to give you a couple of examples using two of them so you can see what I mean.
For the Orestes.
Because this ship has a large area of nice clean flat surfaces, it was just a case of starting with the black and then building the colour up slowly stage by stage. As you no doubt know, painting a light colour such as white or even light grey over a dak colour like black doesn't tend to work well. The way around this is to build the colour up stage by stage by layering up intermediary colours and working up to it.
In the case of the Orestes, I started by block painting the main hull in a dark grey (GW codex grey). Once this has dried fully, I selected a lighter grey (Vallejo stonewall grey) and again, simply block painted over this to take the hull up to a lighter shade overall.
From this point on is where I started to build up the shading. To the stonewall grey I still had on my palette, I mixed in a little of the next shade up (Vallejo wolf grey), which not only lightened it, but also added a hint of cold blue. Keeping the paint quite thin, say the consistency of milk, I painted 'almost' all of the areas again, but deliberately concentrated on the hull panel edges and not so much the centre. By adding increasing amounts of the lighter colour to the mix and keeping the mix loose with more water if needed, you can start to increase the density of the paint away from the centre towards the edges. This has the effect of gradually increasing the pigment density from the centre outwards which means the light falling on the model is reflected differently and it is that which makes the graduations appear differently.
You don't have to follow quite so many stages if you don't want to, but for me the next was to add (Vallejo ghost grey) to the mix and really focus on just the edges. A final pure white was then added to pick out the edges and highlights.
Tip: If after all of your blending, it still looks a bit patchy, or you want to just smooth it off a little more, you can give the panels a pure white wash which will sometimes help. For the wash simply mix white with water to the consistency where you can see your palette clearly through the thin paint and 'lightly' apply the wash (in other words don't overload your brush, more thin coats is better than one big one! Its always easier to add more, but not so easy to take it away). When it dries it will help just like an ink smooth the graduation.
For the Artemis:
The Artemis however is slightly different in that unlike the Orestes, it is heavily textured. Applying block painting this way wouldn't work as you would lose all of the panel lines. So I cheated :wink:
With the Artemis, I started by dry-brushing the entire model using the same palette order (codex grey, stonewall, wolf and ghost). Once it was nicely highlighted, I gave the whole model a black wash. This was a mix of watered down black paint with spot of black ink and a paintbrush tip dot of washing up liquid (the soap breaks down the surface tension and makes the ink flow into the gaps in the detail better!).
Let it dry.
The final stage once the wash had dried was to pick the colour out again. I did this by giving the model a 'very' light final dry-brush of ghost grey to soften it up to the eye and then carefully painted the larger of the individual panels in a mix of ghost grey and white. I didn't try to be too precise, I just wanted to give some depth to the panels. In many ways the technique is exactly the reverse of the Orestes in that rather than concentrate on the edges, I simply wanted to deepen the pigment in the centre of each panel in a way dry-brushing will miss. A small dab of paint on each did that.
The end result is then a combination of dry-brushing and block painting which gives you the smooth colour, but still the highlights and black panel lines.
In the case of both there was obviously a lot more detailing to be painted, but hopefully the above answers your question about how I did the primary greys - white.
Hope that helps
Best regards
Carl Woodrow
www.dropship.org.uk