Hi and welcome to the forum.
In this state I have my doubts. The felttip coloring looks rather messy in some of them and slightly crumpled up line-paper is generally not the sort of stuff people like to pay for. The way you are presenting it makes it look like nothing more than some sketchbook doodles. Now there's nothing wrong with sketchbook doodles, but most people aren't over-eager to buy them, I think.
The designs themselves aren't bad, but I feel they might work better when applied to something. Maybe on a mug, a card, the cover of a sketchbook, and so on. Try thinking a little further with it, basically. Perhaps you can also use different materials, like inks or acrylic paint. That way it's easier to get nice, even colors.
Just to add to what has already been said, if you do some sort of similar design on some nice quality paper you could probably sell prints through a website like Redbubble where they could be quite cool designs on something like a mug or cushion etc.