You're the only one here who hasn't got any comments yet...so I'll give you some!
Your drawings aren't too failed - they're definitely a lot better than my brother's, and he's eight. I'd say, truthfully, that you're quite good for your age at drawing but not EXTREMELY good. Out of 10, considering your age, I'd give them 7. They're better than mine when I was your age but not as good as I think they could be. Things you could improve:
- better proportions. Proportions (sizes of different parts of the drawing) are very difficult when it comes to Tamas; try copying either an official BanDai Tamagotchi picture (copying off Tamas' packaging works) or a picture drawn by someone on TT who is very good at art.
- arms higher up. The arms should start at the join between the head and the body (check out kurofan's Melodytchi).
- better shapes/symmetry. For example, Violetchi's head is not supposed to be square-ish and Ringotchi is slighty mis-shapen. The only way to improve on this is practice.
- body, arms and legs joined on most characters. Again, check out other people's drawings - their Tama characters' bodies look like jigsaw pieces in a way, with the bodies all drawn in one pencil stroke, instead of a body with the arms and legs attached.
- generally more accurate. For example, Memetchi's arms and legs are supposed to be sticks, and her curl is supposed to be larger. Kuchipatchi is fatter than you've drawn him.
- more detail in the eyes. You can invent your own eyes for some characters and it looks fine (for example, I sometimes draw Lovelytchi with Melodytchi eyes and vice versa) but for some, like Mametchi or Kuchipatchi, copying the eyes from an official BanDai picture is the best method. Make sure you get the right size.