After my foray into the berries and ripe rosehips, I found a couple of under-ripe rosehips which had a lovely tinge of yellowy/green and a gorgeous round shape. using just a few colours to achieve the colour on the fruit prevented overworking, a muddy finish and, hopefully kept things fresh.
Firstly, I applied a pretty strong mix, (be brave!) of Indanthrene Blue, Cadmium Yellow Light with a touch of Perylene Maroon over a glaze of water. As this dried I dropped in a lighter mix of Winsor Lemon with just a dot of the green mix to create the lighter side of the hip where the light fell. Using a damp brush I pulled out some of the colour from the centre to create the shine. Getting the timing of this bit right has been trial and error and control is the key., I have taken a few tips from the short clip by Billy Showell, which helped a lot.
Building up the strong green by adding more blue and a touch of Neutral Tint, leaving a slight 'halo' to the edge and keeping away from the highlights and the yellow enphasized the roundness. A couple of washes of Umber with other 'neutral / brown ' mixes finished the sketches off.