Step 3. This is where it starts to get enjoyable. Once your head is completely dry draw a set of basic outlines on your clay so you can see which parts have to be built up. Once you've done this you can start by sticking chunks of clay onto the areas you want pronounced,
You have no need at this stage to be neat, really whack it on and build up the important parts and always make sure its symmetrical. Work the clay smooth with wet fingers until its a rough shape of Ironmans helmet.
Step 4. With war machine there are parts that are a lot more pronounced than others, so, same process as before, wet fingers and whack that clay on and smooth it down so no edges. Feel free before had to draw on the head again the parts you're going to build up i.e the jaw, mohawk. Whilst building them up your going to want to save yourself some work later and smooth it down as much as you can. I used a set of clay modelling tools i brought from amazon for £3 and they were perfect for shaping the edges.
Once this is done draw on the edges that have to be sharpened up and add more clay to get the right angles your going to need in order to sand them to the right sharp egde shape after. Dont be too fussy as this clay sand really well.
Wait for the clay to dry completely then just go over the whole lot adding little bits of clay to fill in those little holes you think wont sand out and he should look something like the pictures below.