Paneling - or Line Marking

using a panel marking pen or pencil really helps a lot making unseen same color lines stand out, the sharper the marking it has, the better. so far the best paneling pen as of today recommended by me is the 

✔ GP01 GUNDAM MARKER INK DRAWING PEN "SHARP"

followed only by gundam markers with 3 color variations

✔ Black
✔ Gray
✔ Brown

the Drawing Pen is basically just a normal sharp point mechanical pen, with sharpness of 0.3, and can detail the smallest gunpla parts.