Here are a series of books designed Dana Tanamachi-Williams for a few classic childrens books for Puffin. She used coloured chalks to draw the covers at A1 scale and then scaled them down once scanned in. The coloured chalk is much more apropriate for a childrens book as displayed above, but I believe a black and white cover design is much more subtle in this aesthetic and more apropriate for an older audience such as the audience for 'Dream Psychology'.
Lucy Stephens uses silhoette styled illustrations of the authors as well as hand-rendered type to create quite striking images really stand-out on coloured backgrounds. This style may be suitable due to the fact that Sigmund Freud's image is quite iconic to him. The glasses, beard and nose are very unique to him.
