Godster hunterrr c: You've improved a lot since I got the art piece from you!
I think if these would have clean lineart and if you improve on arms and legs, you could start selling them for a small price if they are colored as well! To me it doesn't matter if digital or traditional, as long as it has clean lineart and clean coloring.
You also tend to make them standing a little bit crooked. Make a straight line in the middle of the body and use it as orientation so that this is not gonna happen! You should also take a look on hands anatomy. Sometimes the thumbs are at the wrong place etc xD Sometimes it's just helpful to look at your own hands and imagine yourself standing in the pose the character does. Otherwise, there are still mirrors or ask your family to play model for a second. That's what I often do ahah
And think of a pose. Doesn't have to be difficult; but your drawings basically stand like a jumping jack
lil old tip from old hag Keitara: for poses, try googling sims 3 poses (cute/couple/etc) and look on google images. they may be 3d and have human anatomy, but I think it often helps looking at these to get an idea for poses or to understand how it should at least look like to get a basic understanding and image!