Can I use my own pencil set?

Yes. In the "Color by number" card, click "Set up" next to "My pencils" ("Edit" once you have a set). The "My pencils" window lets you:

• Start from our plain sets: "12 basic colors" or "21 colors", named in the book's language.
• Change each pencil: its color (color picker or code like #6CB4EE), its name as the key prints it (up to 30 characters), or remove it.
• Add a pencil (up to 48).
• Paste a list, one pencil a line, for example "Sky Blue #6CB4EE", "#6CB4EE Sky Blue" or "Sky Blue, 6cb4ee", then "Add these" or "Use only these".
• Keep the set (give it a name) for your other books on this computer; kept sets appear under "Start from:", and the small x next to one forgets it. Click "Use for this book". A set needs at least 2 pencils.