Based on the principle that essentially all guitar playing (in any style and to any standard) is born of perseverance, the first "perspective" is a very simple question to ask oneself before practice, and then once again after a note (or a few notes) have been played. Where we can chose and direct what we persevere with, it's worth offering considerable conscious effort to carefully identify what may be worthy of our perseverance rather than to "sub-contract" that responsibility out to teachers, books and magazine articles. In the interests of making the best, most effective and economical use of practice time, asking the very simple (but far reaching and highly potent question): "How do I really want to sound?" may seem simplicity itself, but how far can an answer to this question go? To what extent is the potential answer "I want to sound like player X/Y/Z etc..." appropriate or in any way helpful? Why ask it? "What are the benefits of such extensive consideration?"
I would suggest that the more detail you can go into in answering this question, the better. The more players as reference points or influences you can list, the more resources you may draw upon to structure a method by which you can achieve your goals. The more descriptive the sounds and the more you can be as specific as possible in every aspect of "how you really want to sound", the better chance you have of sounding as close as it may be possible to that sound you have in your head. Answering this question as fully, and as accurate as possible will guide almost every decision you will make that will offer a considerable contribution to your playing. Choice of exercises, teachers, instrument, amp, pedals and other equipment (where appropriate), in fact almost every part of the activities you engage in, in order to become the guitar player that you want to become is influenced and guided by the answer (in all it's comprehensive detail) to this one simple question.