@rogi92 Hi Rob, my first thought was to take a sphere into sculpt mode and turn on Dynamic Topology and just have fun carving and building up the shapes and surfaces. Once you are close to the finished product, use retopology techniques to bring it back to its hard surface glory. There is an older course that touches on these topics. The theory is there, but the version of Blender is a little out of date. https://cgcookie.com/course/modeling-a-sci-fi-helmet
The other thought is similar, but using primitive shapes like spheres, cones, cylinders and place them together so that you get the overall shape you want, combine them into one object, and then retopologize that combined object.
I hope that helps. Great photo references, by the way!
