Personally I wouldn't wear either of these head textures if they were given to my for free. You need to work on your texture detail, most of these heads are occupied by totally uniform yellow "paint bucket" space. Try making a head that doesn't have a face...then eventually you will realize that detail > expression/humor.
Also, dont make 512x512 textures. Nobody with a 512x512 head would wear a super low quality head. Make 128x128 for noobs.