Hey there! It's already looking pretty fun as I see you're pushing the size of the features towards the larger side. I would recommend selecting certain features to make smaller or pinch together to counterbalance the features that are larger and make them really stand out. For example, if the eyes are meant to be wide apart and the glasses area large, then pinching the forehead to become smaller would really help sell the idea of a large eye area in comparison. It also helps to reference the standard Loomis head proportions -- if you notice any particular feature or proportion in your model that deviates from 'average', that's a good place to exaggerate. For example, if you notice your model's face is longer and more narrow than average, really pushing the longness of the face in your caricature will help emphasize that likeness. Hope this helps! :)