Use this picture as a template for your nose. Use this image in your face and then use this as a guideline. You do not need it to be completely like this. You can make anime type nose to any type nose with this. This is not the perfect shape but it helps me sometime when I can't figure out nose.
I used the nose image as a template or guide with opacity less (like 40% 
you can set as you please )
you can set as you please )Then I colored it randomly. I usually do not use reference so when I like something I use that drawing as a reference or template. (In my brain too sometime imagine like that.) A few example and a process>
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