Diddly. Nice work!
Not that you need me to explain it to you, but I feel like explaining the significance xD
Basically the frame is for posing- I see you are great at free handing poses. Most people suck at it x) Basically the frame is there for structure, as it helps give you the general impression of the character or drawing as a whole, and then you can plan accoridingly. It also helps with enviornments, because you can build the general flow of everything around the character. (Though, I can't draw enviornments atm.) I'm just really surprised you don't frame. Your line work is quite excellent for not using any base whatsoever. If you like, I just throw up a drawing of how the structure works? Otherwise, keep on what you are doing.
Okay so heres the deal on the whole wire frame dealio. I don't have access to a scanner so I'll just type it out. Basically, you start with a round or square shape, for you round, since you have a very anime style. For myself, it would be in between round and square, because I only have minor animu influence.
So- star with the head. Then a little further down, you draw some sort of cylidar or rectangle, or barrel shape for the chest, then where the waist typically goes, draw some sort of upside down trapazoid shape. Connect all those shapes with the proper lines: Neck and waist lines.
Then, what you need to do is draw the joints. Two for the shoulders, two for where the legs start. Then proceed to draw lines according to where you want the arms. First do the upper arm (biceps, triceps area) connect that to the shoulder joint, then make an elbow joint, with an small circle or oval. The do the forearm, and connect that to a box or triangle shape for the hand. Rinse and repeat for the legs.
Upon further examination, your proportions are almost there but still a little off. If you prefer to completely free hand what you draw I suggest this, get your head shape drawn, and then draw a shoulder line under the head, and just imagine a neck. Your proportions need to be spot on, because when you have a head that's just a little too big for the body, your characters appear obsurdly young. As this girl does.
Keep up the good work though!
Maybe it's just the hair... because the head fits on the neck properly. Eh, whatever. Lol