Ruffs tournament

I am currently working with these four paintings. Three of them portray Ruffs displaying and fourth one has Slavonian Grebes. All of the paintings are now in stage where even I question all the time is it possible to complete them to proper paintings. When working with this scratchboard technique you just have to see into future!

I tested using latex masking fluid in the Grebe painting. I realised right away when erasing the stuff away, that it does not work well in this kind of paintings. Edge lines are just too harsh. Painting and scratching process would be easier if I use only light paper masks or just paint the firs layers by freehand. Sometimes there can be then problem when objects in painting have veil of over flown paint around them. This excess paint layer is usually possible to erase or cover.