From experience, if your hair is in you avatar, it will not go platinum, it will turn pumpkin orange. You will have to do multiple bleach processes to get it 'blonde', and you risk the chance that it will still resort back to orange.
Its likely the lightest you can go is a golden dark blonde, but you'll have frequent root touch ups and very dry hair.
I have type 3b curls and mines been bleached a dark blonde, personally I wouldn't go platinum! It's a lot of hard work, I had to bleach my hair from a natural dark brown back in September to a medium golden brown and then I bleached it blonde a month ago. My hair is about 10 times more delicate than it used to be, even shampoo and the hairdryer are so damaging! If you go blonde be prepared to spend lots of money on expensive moisturising treatments, protein treatments and oils (I use coconut oil). I go through conditioner like mad and if you bleach your hair be prepared to give it regular trims as your ends get ruined easily.....having said all this...it looks good!