Making changes to paintings

It is a challenge to paint a subject that really is an idea in your head rather than a scene, person or image before you. It is really difficult to work out the composition of a painting that I want to let develop and grow almost naturally as I paint. In trying to capture a mood or feeling it is very tricky to let the brush strokes flow and yet want to have a good layout and composition in a painting.
When I started the painting I had a clear idea in my head of using a pink 'wild orchid' as the central theme. There was great movement and exuberance at times in the brush strokes and yet I wanted something different at the end.
I had to remove some of the paint and start again on one side of the paitning. I've decided to try and paint the flower in two different sizes. One is huge and dominates the right hand side of the painting and the other is much smaller and looks lore like the flowers growing in their natural setting. It is difficult to determine whether I have achieved what I set out to do or not.
I look at the painting at different angles and I like what I see some of the time and I also vary the angles of the light onto the painting and depending on the angle it makes a huge difference to what I see and whether I like it or not.
An interesting reaction of mine is my response to the use of different colours. In painting this paritcular 'scene' and because I had a theme in mind I find that I really enjoyed using reds, purples and pinks. They captured a feminine quality and energy that I wanted to convey. The red gave a great sense of life and energy, and the pink brought a sense of contentment and ease, the purple gave a sense of strength and depth to what I was doing.
There is also a large amount of green in the painting, not quiet 40 shades. I always like painting with green. There is a feeling of it being natural and conveys a sense of wholeness, healthiness and environmental friendliness. It combines well with white and yellow to give a sense of sunshine and light. It works well with most other colours and deep greens show off well the strength and brightness of lighter shades.