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.btn-upload
	input[type="file"]
		position  fixed
		top  -9999px

$(".btn-upload-el").change(function () { //Если выбрал файл
  if (this.files && this.files[0]) {
  	var currentUpload = $('.modal-upload-row .modal-upload-row_el:first'); //выбираем куда
    var reader = new FileReader();
    reader.onload = function(){
    	currentUpload.attr('style', " background-image:url( "+reader.result+ ") ");
    }
    reader.readAsDataURL(this.files[0]);
  }
});

label.btn-upload
	span Загрузить
	input(type="file").btn-upload-el