Art inspired by the Red Truck

My Mother & I were browsing through a Pottery Barn Kids catalog some months ago and found a Diptych of a Fire Engine. For those of you that don't know what a Diptych is: "A work made of of two matching parts" (now you have your word of the day). So my Mother turns to me and says you could do that! Oh what confidence she has! Then genius struck she added; Oh and you could change out the trunk of the truck to reflect the seasons and change it out. Oh what a genius idea!!!!!
So here we are months later and I finally got around to creating it. My husband is grumbling because he thinks the dimensions are wrong. I keep telling him it is my artistic interpretation (oh and my first attempt). I think I might change it to reflect a true diptych of just two parts, thus pleasing my husband for the dimensions will probably be a little truer.
I plan on hanging this in my son's room. Of course my 7 year old daughter is now asking where hers is and of course she doesn't want a red pickup truck. So will have to work on that next. Funny how creativity can flow and be guided by kids! I am working on opening an Etsy store sometime soon. Want to get more than one item created to sell before I open a store. Feedback is welcome so post your comments and share with your friends.