Help to create tomboi character

[ainst Composer]

hello, help create such a character as in the picture. I want her to look like a boy, but female. I do not know what to do. better default shape and skin (not mesh) but mesh hair and clothes. It seems to be called tomboi. (Boyish girl?) Can someone at the level of the hobby know how to make shapes? what do you advise? I'm just not know how to create a character of a girl looking like a boy ... So it dont look freakish