签字笔在产生笔触的方面具有很大的局限性。因为它只能要么是画出粗细一致的线条，要么是一些点。而这幅原图在纹理和花纹上都比较丰富，其中，有软硬不一的布料、佩戴的金属腰刀、皮质的皮带等，还有虚实不一的阴影。图片上的这种丰富性和工具本身的局限性构成了矛盾，而这种矛盾就使得在绘画的过程中，如何以这个工具来体现这些质感成为了主要的问题之一。
Ballpoint pens are very limited in terms of producing rich strokes. Because it can only draw lines of consistent thickness or dots. The original picture is rich in texture and pattern, among which there are fabrics either soft or hard, copper handles of the knives, leather belts, etc., as well as shadows with hard or soft edges. The richness of the picture in textures contrasts interestingly with the chosen tool – the ballpoint pen – regarding its limitation being mentioned above. This makes that how to represent these textures with the ballpoint pen becomes one of the main questions in the process of this drawing.