Hello and welcome to the cafe! you actually posted this twice, you only need click to create the thread once, then leave it, sometimes it takes a little time to process things. as for your head thats a nice effort, but there are some topology flow errors, ngons, triangles and poles where there shouldn't be and just generally quite messy and unanimation friendly , the ngons around the mouth and upper chin area particularly are going to cause ugly deformations when you try to do anything with the mouth, you also need a couple more clean loops around the mouth, and coming from the nose sweeping around the mouth and cheek area to where the top of the chin meets the lower lips, so that you can get nice smooth deformations for a variety of different poses, Dan @Rectro has some nice face/head topo guides/examples that would be useful in showing you where you've gone wrong and the basic principles of head topology