Antique Willys Truck Christmas Card Tutorial

This lovely 1951 Willys truck (later the company was purchased by Jeep...) was still driving around Thunder Bay, Ontario this summer. The owner was kind and allowed us to photograph it. Such a beautiful and functional vehicle! I have been inspired to paint it a few times. This time, I created a more cartoony version for a Christmas card.
Here are the supplies used:
Arches 100% cotton 140 pound cold press bright white paper ~5 by 7 inches
Green tape
Princeton Aqua Elite and Heritage brushes
Simply Simmons Liner Brush 10/0
Preppy fountain pen in fine 03 for the sentiment
Table salt
Paints:
Cerulean Blue PB35 White Nights St. Petersburg
Lunar Black PBk11 Daniel Smith
Perylene Green Winsor and Newton PBk31
Pyrrol Scarlet PR255 Daniel Smith
My own Shadow Violet mix with PB29, PG50, and PV19