Japanese iris

I don't have the garden where the Japanese iris blooms, so I drew this at a botanical garden.
It was a good day for painting that the sunlight was not too strong.
But I couldn't keep on painting, because rain suddenly had fallen.
I finished painting referring color sample I recorded.
Even if I manually set white balance of camera, the color in photo is different from actual color.
Digital camera is so convenient but my concern is always the color problem.
Fabriano classico 5

Index of my paintings.