Artist's block?

I have come to a dead halt.  I have twiddled and tweaked but added nothing new.  I have drawn lovely things in my sketchbook but they don't seem to fit on the finished piece.  Cannot seem to move on at all and I don't know what to do next!  That marigold intimidates me.  Maybe another periwinkle flower?  I would like blossom and I have drawn cherry, damson and apple.  None seems right.