pbel, I posted 15 pictures down in the Latin America Ornithology forum of Scarlet Macaws for your perusal. I didn't know which version you would like, so I went after photos that showed explicit details of ventral and dorsal colorations and as many side shots as I could. I was hoping it would help you know the colorations well enough to do a composite, not knowing your style, only mine.
I did an applique work of a Resplendent quetzal a few years back after saving and inspecting 30 pictures, but I didn't know exactly what I was doing till it was finished. In order to do an applique, one must almost be a cartoonist to simplify lines yet make them true enough that people will get the feeling of what one bird really looks like. It's huge, and my husband's dementia kicked in before I could get him to make a photograph of it. The old computer went gunnysack, and the repair guy decimated every file on the computer. You really have to be careful about recovering files when you pay someone else to fix a computer. He ruined my artwork files, so I don't have a fraction of my work recorded anywhere else. The problem I took him--a burned out lightbulb did not justify his destruction of my files, imho. He destroyed 10 years of my life's works. Quilts are given away to charities or sold. If you don't have backup pictures, you can't show your stuff.