first replace the snap shot avatar with something looking at us and brighter. you shouldn't seem disinterested.
then make sure you can print them - this has edges showing and is tight in the corner. you have so few keywords in this. list more. tell us about what this is, more than the medium.
this should be bigger, nothing more frustrating in finding out that not all images are the same size. everything should be poster sized, this needs a crop at the bottom. presentation is important.
i assume thats your name at the bottom, don't crop it off, they won't print it.
you'll want to increase your prices a bit
the thing that will be hard is finding an audience because these are all rather generic. typically if you make a series of say - old people you can find old, elderly,aged people, retiring people, golden year people and sell to them. but if you have a bunch of things you drew just because you felt like it - it will be harder to sell those.
you may be able to entice cat people, though i think your signing it too large, it becomes a distraction when you sign it like that. but if you go on twitter and mention #CatArt and the like - you may get buyers like that. if you had images of dancers, then you do the same thing.
sometimes its a title change - like i would call this the "knitting club" then you can apply it to them. a generic becomes a specific. then you can fill up your keywords as well. i don't know of how many would want a group of people talking. but if they were into the thing you title it - and describe it as - you have a better chance at selling it.
add the breed, three, 3, animal, vet,veterinarian, pet and anything else you can think of. again add descriptions so people can find you.
---Mike Savad
MikeSavad.com