It is pretty difficult to give a person advice without having an idea of his or her level of experience, and his or her style, and without having seen a good number of his or her photos. We really do not have much of an idea about how capable you are or what your fashion type photos look like. I can only remember the yellow windbreaker shot from a month or so ago, and therefore it is difficult to know what to tell you except to keep at it and to keep practicing. Self-portraiture is an art form and I think it is much more difficult to shoot a good photo of yourself than it is to take an equally good photo of someone in front of your camera.
I don't think of posting pictures as a way to gain credibility, but rather as a way to show others areas which you might be instructed to improve upon. If for example you tend to frame with too much top space, that is a tendency which typically reveals itself in as few as 10 photos taken by a single person over let's say a month's time. If you tend to include lots of extraneous background stuff, that tendency would reveal itself quite quickly and we might be able to suggest that you use a longer focal length to narrow your backgrounds and thereby increase your background control.
When you ask for photographic advice, it is customary to include samples or some way to let people see what areas your work could benefit from improving in. If you have a URL or an Instagram or Facebook account with photos, perhaps you could share it with us here and we could give you some advice that would be tailored to your situation and your current state of ability.
Tips and tricks? None that I know of, really. Unless of course you mean fundamentals. Like really looking at the viewfinder and literally seeing what it encompasses or learning how lens focal length affects the background width and magnification. It's kind of like asking for tips and tricks to becoming the next Ernest Hemingway. It's not about tips and tricks, but about learning and getting a firm grasp of the fundamentals of the craft.
The last person that I tutored, I saw perhaps 1,000 of her photos, and within about six months we had corrected her main areas of repeated failure.