Monochrome Oil Painting Technique

Today I worked on another oil painting technique. The book "All About Techniques in Oil" stated that "forms and values are suggested by the contrast between different values of the same color." I was pleasantly surprised when they suggested to use my chosen color plus white. I pushed myself to paint today, so I took a photo of my subject - vase - and de-saturated it for ease.
	First things first, I needed a basic layout. I always need a sketch first - for all my paintings. Here I used an HB lead. Although, in an oil painting class I took, the instructor suggested to use charcoal because it was a medium that most behaved like oil painting. I have never understood that. I must not have heard her correctly. 😂 It's listed at number 13 on my techniques to try.
This canvas size measures 4" x 2-7/8". Again, stated in a previous post, it's a sheet from Rolodex mix that I prepared with some stamped or gel press mono-print papers.  The original vase is a muted green, so I thought I would "cheat" and use phthalo green. I think most painters use umber or a neutral. I'm satisfied with how my painting turned out, but I see I could have used a bit darker value under the flower on the left of the vase. Maybe that would have helped round out the shape a bit. It also could use a surface to keep it grounded. Maybe even just a line.
	Over all, it was okay. I did feel like I wanted to add black to the shadow green. And PG7 is such an overwhelming and intense green, I would have liked some red to mute it. I bet the charcoal sketch would have come in handy for that. 😁 That might have to be my next technique! Until then!