I have now done further work to the small painting with butterflies.
I have added detail to the landscape, particularly to the flowers and plants in the foreground. For this, I have been using Paynes Grey, Indian Red, Burnt Umber and Titanium White, as well as Lemon Yellow and Ultramarine for some of the flower detail.
I have also added detail to the butterflies. I had already established the Peacock and the Small Tortoiseshell. I have now defined a Painted Lady, Red Admiral, Purple Emperor, Cloudy Yellow, Brimstone, Chalk Blue and Adonis Blue
I have found that mixing the oil with a glazing medium (diluted with turpentine) leads to a flatter application and significantly reduces drying time.
I will still need to leave it for about a week before I work on it again.
The painting now looks like this: