I make a picture with pastels. Much of the time I use a photo as a guideline, and then color with pastels. I then scan the picture with my printer and put it into my IPHOTO program on my Mac computer... from there I make changes to the color- (adjust contrast, hue,). I save the file onto my computer that way I can go back and make any changes at a later date and/or print a copy for personal use. I use to keep all my "originals" in a box, but the box got so full and pastel powder tended to transfer from picture to picture- I threw the box out when I moved- but keep the pictures on my computer.... I find it so much fun to do and when I am down it cheers me up to try to create something colorful... I hope that helps. I believe you could do something like it yourself and use almost any photo program or fotoflexer.com on the internet.
Then you print it out on what kind of paper? I am sure it looks pretty, but it won't have the texture and "feel" of real pastel paper, as an original or a Glicee print does.
However, as I said, you have talent and the paintings are very cheerful and appealing.
I just print them out on photo paper, or you can use a textured paper such as an artists pencil drawing paper. When I draw, I keep it simple and use just ol' computer paper or whatever I have lying around. I can't seeing spending to much money on specialty papers and such, since I usually scan and make adjustments- and the original usually gets set to the wayside because the computer just seems to make things more bright. On my photo program you can adjust the "sharpness", "contrast" and reduce the "noise" this adjustment helps create a more, "real" look to the photo...