Are you concerned about the conservation, care and longevity of the materials?
Don't worry, I got you covered!
All you need to know to keep your painting in perfect conditions for a very long time is the following:
Basically, if you have these 4 topics under control you will maintain the integrity of your pastel paintings for ages without any issues.
Keep the painting vertical. Tiny dust particles won't accumulate on the painting surface but will be at the bottom of the frame instead.
Don't keep your paintings under direct sunlight. Don't worry, your painting is not a vampire but under a long period of time the sun light will start to decompose the mineral pigments, some colors faster than others, so just avoid it and get a good artificial light to exhibit your artworks indoors.
Humidity. Not too low and not too high, the important thing to remember here is to avoid extreme variations as they can interfere with the adherence of the pigments. Keep it between 40% and 50%.
For pastels, a frame with glass and passepartout is a must. You want to protect the artwork as best as you can and the passpartout will create space between the artwork surface and the glass, keeping the piece safe for many years.
And with these you are good to go. Your paintings will remain vivid and perfect for ages!