first image - your calla lily with very subtle line drawings of a window (building?) and street light. I really liked the ghost image look of the lines so I just added a small bird in the upper right corner.
second image - part of a calla lily with red lines echoing the red line you used on the edge of the flower - clouds with echoing lines and raindrops.
third image - looks like you started a still-life with an orange, so I drew a faint pencil outline of a bowl with more oranges.