Sorry Microsoft there are a lot of problems with the way you handle fonts and spacing.
For best results with a drawing use a very fine liquid roller ball style pen on white paper (i.e. photo printer paper or similar). You can do many signatures or drawings until you get the look you like. As for size the bigger the signature or image the better the detail in the stamp. Circle the image(s) you like. Then scan the sheet and email the PDF, PNG or JPG image to email@example.com. Please include a note of introduction, send links to your site and work, it is fun to make new friends from all over the world.
We do all our work in Adobe Photoshop and Illustrator so PSD and AI files are the best. Any vectored file format works with the fonts outlined are welcome. A screen shot of a large design works great in a PNG format. Microsoft Word Documents are needing too much help with fonts and spacing issues to guarantee a good image from.