Unlike transparent watercolours, acrylic is an opaque medium, so, like oils you can work from dark to light. It can also be used in transparent washes like watercolour and when used like this it will need to be worked light to dark. Of late, there has been an increased tendency to apply acrylic paint thickly with palette knives and new extending mediums are available to make the paint go further and dry more slowly.
Acrylic filled the gap between watercolours and oils, now we have quick drying, Alkyd oils, and oils that mix with water, acrylics may drop out of mainstream art?
I wrote a hub about this a short while ago...hubpages.com/hub/A-Beginners-Guide-to-Paint.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.