Let's be honest: None of you probably use the built in drawing tools. It doesn't even let you smudge for shading, and there's no pixelated option except drawing EACH AND EVERY pixel with rectangle tool. (Note I am posting this while using construct 2. I haven't explored 3 thouroughly, but it looks pretty much the same here.
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Animation Editor is better in C3. While not as advanced as proper image editing apps, it has lots of new useful features.
The most irritating thing about it though is that you can't copy/paste images with transparency from other applications. You need to save files to disk and import them, so much extra work...
Thank you so much! Do you personally recommend using the built-in, or an outside design interface?
I use the built in editor extensively for placeholder graphics.
For any production assets, I would never use the built in editor. There are many excellent options, such as Adobe products, Inkscape, Spriter, Gimp, GraphicsGale, Ect.