Add more cherries if you'd like a deeper colour. Or if you cant get great red glace cherries you can put the tiniest drop of red colour in the filling.
Notes
Don't add chocolate to boiling cream. The chocolate could split.
If you find that you may have done this and the mixture is not smooth and it looks a little separated then shock it with a tablespoon of very cold cream or milk and stir through quickly. This often brings it back together.