Those are fantastic drawings and an awesome way to get them out of a sketchbook!
These are lovely! If you want to give them a touch of color, I have found that Copic markers (alcohol markers) work pretty well for finished Proofgrade surfaces, and Prismacolor colored pencils work great for the unfinished ones.
Thank you for your suggestions! I’m excited to play around and experiment! I have all kinds of kookie ideas for transforming the materials that can be cut into looking like the ones that can’t. I’ll post my results as I finish them! For these, I sort of dig the sepia tone of the etchings… but I might hit the petals of the orchids with some pearlescent paint washes. (I sort of liked the look of the sticker before it was peeled off! LOL!)
Oh, those are lovely! They would look fantastic with a light color wash. 
Thank you! I agree! I’m going to play around and see which mediums look best.
Beautiful! Love to hear of ideas brewing - can’t wait to see what else you create.