Since you are using acrylic and oil painting, it would be better to use "fixative" for your artwork to protect your artwork from being scratched. Using fixative also maintain and improves the vivid colors of the oil paint you applied to your canvas. I've been using that clear spray for about few years now for my Graphite and Charcoal drawing to achieve a long lasting quality of the artwork they've commissioned to me
Fixative Comparison: https://www.jacksonsart.com/blog/2014/08/29/fixatives-are-not-all-the-same/
Just a heads up, accepting BTC or any other top cryptocurrency would be a good idea if you are selling services here. Nice meeting a cryptoartist here.
I was actually thinking of getting them framed and using a varnish if necessary , Thank you so much for your help ✨❤️ , unfortunately where I live there are very limited art supplies, I will try and find the fixative if I can , plus clear spray is a really good idea .