What features should I look for in a comic making app for Android if I want to create professional-looking comics?

Look for features like layer support (essential for complex artwork), a variety of brush tools (for different line weights and textures), customizable panel layouts, speech bubble tools with adjustable tails, font options, perspective guides, and export options in high resolution (e.g., PNG, JPG, TIFF). Vector support is a bonus for scalability.