There are various applications that may be useful to you.
Some of them require local installation, while others are available online, via a web interface.

Here are some applications to consider :

Canva : This is a graphic design tool that offers a set of templates and tools for creating line drawings. 

Adobe Illustrator : To create graphic images, you can use Adobe Illustrator. 

Inkscape : There are several programs currently in use to create images : This is a free open source vector graphics editor that offers a set of tools for creating line drawings. 

Once you have created your drawing, you can use it for a variety of purposes, such as printing or posting it on the web.

Although not specific to the task at hand, I'd like to draw your attention to two other programs you might consider:
1. Blender;
2. Z-Brush;
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