Vector pen ink textures. Diagonal ink strokes and doodles with varying thickness. Ink hand drawn textures. Hatching drawn with pen. Abstract background. Design elements 渐变墨迹纹理集。垂直油墨描边和涂鸦，厚度不同。墨手绘制纹理。用钢笔绘制的孵化。抽象背景。矢量设计元素