This tutorial includes templates which will help you with the sizes and shapes. Click on the 'Templates' button below to download them. 

35.

Roll two tapering down towards one end sausages (one longer one shorter)*. Roll a few small tapering down towards one end sausages. Leave them to dry for a few minutes. They should hold the shape quite well but shouldn’t be very dry. Trim the wider ends at an angle and stick them with a small amount of glue as shown in the photo.

* I used 7 mm and 11 mm balls of brown flower paste. I trimmed the branches quite a lot later.