I just recieved a lovely comment from Fran C. Asking how I have done the gelatine plate monoprints. Instead of me re-inventing the wheel, the best thing I can do is refer you to the website of a Textile artist, Linda Germain. Not only does she tell how to make the plates, she has YouTube video of the "how to" as well.
This is where I learnt how to do it!
And to answer your other question Fran - the feathers did not begin with feathers They are cicad fronds. I used them as a mask and then took a second print from the plate to pick up the paint left by the mask.