Finally, someone with more chest hair than me! Welcome HermanCR. Clearly you already know you have an excellent beard. You also have a great sense of style it looks like. To answer your question, I would say that it is probably best to continue to maintain a neckline if you are going to be interviewing for professional jobs. Establish yourself at that job and then determine based on company policy and what your boss says whether you could let the neckline go. That's my advice!