Okay first off you shouldn't draw a notebook. I would advise you to get a sketch book because it's hard to draw on as the pages are very thin. As well as the fact a lot of colours go through the page and what not. Aquire a sketch pad.
To the crit:
First of all you have very little shading. While this is not a bad drawing it lacks a lot of depth. Your outline is way to dark. Try making it look a little more subtle. Saying that your outline on the rgiht hand side is much lighter than the outline on the left and on the right the outline is fine. The head maybe needs a slight lift off the body as it looks like he has no neck. The face is drawn well and it is majorly a good drawing. The dark blue you are using is a bit rough so i'd advise usong softer colours.Also clean up your out lines. I can still see lines that shouldn't be there. The page itself also needs a run over with the rubber.
Well the first thing i noticed about this is that Links head is slightly big for his body. Next is your lines, you should clean them up big time.. It looks a bit like you scribbled over your drawing. Besides that the drawing itself isn't too bad just work on the dimensions and make it a little less retangular. When you are drawing try to picture a real person or how the character would look in real life rather than basing it off the in game character. If you ever look at concept are of characters it's a lot more in depth and natural that then the in game character.
For example if you look at pokemon sprites then look ay Ken Sigamori's art there is a major difference.
The quality in your drawing takes a dramatic leap here. This drawing is great. The shading you did on the upper part of mairo looks extremely well but as you down say twirds the jacket the shading isn't so great. The jacket is very plian. Try adding a pocket and such to it then you can add shading and viola you have life.Hands need to be workes on. The hand touching the hat is very big and messy where as the other hand is very small and skinny. I also think the legs could have a slight width increse but it's not ruining the drwing or anything.The text is nice again it just needs a slight touch up. It's very bold.
Meh i wouldn't be mad about this.. It looks like a bunch of scribbles bit to be honest it's more the way you presented the individual letters. They are kinda smushed so i cant see them at all.. I can make out about 4 letters. I sugest redoing each letter big and on a sereate page each. It's just a little messy though i think if you did as i sugested and took your time these could be a nice little set. Try not to go out of the confounds of graffeti and into script wrinting as these just look like someones hand writing in places. So study a little more about graffeti and see different styles and i'm sure you'll get the hang of it.
It's readable which i like. though the black ruins in for me.. Have you seen a lot of black graffeti? It's generally colourfull. Remember it is art, art isn't all black. Not bad though the lettes are nice and readable though again it is a little messy. You need to fill n the with dots here and there and make the letters stand out a bit more.
Wow i like the colouring in this! It's a smashing drawing! The original outlines need to br rubbed out. So you need to clean up around The edges. Mario's head is a little big though thats the only thing. I think it could have been about a centimetre smaller all around but not too bad well done
Overall your drawings are above average. For your age the mario is very good and the other drawings are pretty cool too.
Things to work on:
Shading
Graffiti
Outlines
Colours
Things to buy:
More colours (perhaps)
A sketch pad