Here are a few options for the description of the WordPress tag “線上繪圖” in Traditional Chinese, each with a slightly different focus:

**Option 1 (General and Concise):**

> 關於線上繪圖工具、資源、教學、技巧等相關內容的標籤。包括各式網頁繪圖平台、數位繪圖應用等。

> *Translation: A tag for content related to online drawing tools, resources, tutorials, and techniques. Includes various web-based drawing platforms, digital drawing applications, etc.*

**Option 2 (Emphasis on Usage and Exploration):**

> 探索各種線上繪圖的世界！在這裡，您可以找到關於線上繪圖軟體的使用心得、創作靈感、技巧分享，以及最新的工具介紹。一起發掘數位繪圖的樂趣吧！

> *Translation: Explore the world of online drawing! Here you can find user experiences, creative inspirations, technique sharing, and the latest tool introductions for online drawing software. Let’s discover the joy of digital drawing together!*

**Option 3 (Focus on Specific Tools and Platforms):**

> 收集了各種線上繪圖平台、軟體、以及教學文章，例如：Sketch.io、AutoDraw、Google繪圖等。助你輕鬆進行線上繪圖創作。

> *Translation: Contains various online drawing platforms, software, and tutorial articles, such as Sketch.io, AutoDraw, Google Drawings, etc. Helps you easily create online drawings.*

**Option 4 (Slightly more advanced and SEO-friendly):**

> 關於線上繪圖的標籤，涵蓋免費線上繪圖工具、數位繪圖技巧、圖形設計教學、以及線上繪圖趨勢分析。想學習線上繪圖，就來這裡找資源吧！

> *Translation: A tag for online drawing, covering free online drawing tools, digital drawing techniques, graphic design tutorials, and online drawing trend analysis. If you want to learn online drawing, come here to find resources!*

**Which one to choose?**

* **If you’re aiming for brevity and broad coverage:** Option 1
* **If you want to encourage engagement and exploration:** Option 2
* **If you focus on specific tools and platforms:** Option 3
* **If you want a comprehensive description and incorporate some SEO keywords:** Option 4

Remember to choose the description that best reflects the content you’re tagging with “線上繪圖” and your website’s overall tone. You can also customize these further based on your specific needs.