May I ask a question or two?
How large are the originals? How did you digitise them- scan or photos?
Do you use masking fluid?
Are the stars spattered in a different medium?
I really like your technique. I have been getting back into watercolours recently. I hope you don't mind me asking.
hmmm..... Sunblock, Jupiter, and Saturn are probably 4x6in the larger ones are 9x12in or 10x14in. I have an Epson Perfection V500 bed scanner. Which I got on ebay for $50 the box had never been opened by the previous owner. Really to take a decent quality photo you need an SLR, lighting, and a tripod right now I just don't want to plunk down that kind of cash. I usually scan in at a high dpi 700 or 1200 and create a tiff file this way I can make a small image large if I want. I use gimp to clean up images and stitch together images that are too large to scan in one go. The Jupiter painting has very clean edges because I used gimp to clean up my circle. Then I resize as need and export as jpg for posting on a blog, twitter, here or whatever. I export a png for things I want to print because that format keeps the layer data.
I used masking fluid on the bears. But, I don't think I used it on the others.
The stars are Amsterdam or Coptic White ink. Sometimes I use gouache but I prefer opaque white ink. Basically any opaque paint will work I have seen people use fluid acrylic with good results as well.
Thanks ! I don't mind answer questions. I just don't get on every day anymore so my responses can be slow.