I loooove sliptrailing. Usually my sliptriailng is just dots or other patterns, but occasionally I get inspired to do some representational marks. Even the abstract marks are botanically inspired, and in June there is a lot of botanical inspiration to be had in my garden.
The green you can see peeking out from beneath the slip is food coloring - I find it helpful to loosely paint out my marks. It saves me wasting slip by trailing, wiping off, trailing, wiping off, and so on.
These are more generic but I think I could minimally adapt them to reference poppies. The difficulty with slip trailing is with depth - trying to represent some blooms or petals behind others can sometimes turn into just a blobby mess! On these last two the food coloring serves to mark out the spacing for the scalloped design - this has greatly improved my placement! It has he advantage over pencil or needle tool in that the lines are clearly visible but do not have to be removed later - the food coloring just burns away.