On a whole I like this picture; first impressions are awesome character, awesome hair.
However, I notice there are a few things that could, well, do with improvement. And for the love of god, all those Naimane cultists out there please don’t flame or put death curses on me for not being 100% positive and sucky uppy XP. My first thing, and I know you said don’t mention this but fuck it. STOP BEING SO GOD DAMNED LAZY WITH YOUR COLOURING, seriously it flows out or doesn’t meet the line in so many places (*cough* bottom left mushroom stalk *cough*).
Next point, feet, you really need to work on feet, I think your aware of this as you have mentioned before, but that foot looks like a black potato made of straight lines. Next, shadows, now I am in no position to lecture on shadows as I am the king of FAIL at shadows, but he has shadow coming from both sides of him, wtf kind of lighting is he in? From the rest of the picture light appears to be coming from top left so why does he have shadow on his right shoulder (our left) when there is nothing to cast a shadow, so like planning the paths of certain things within the picture more carefully, not just adding them where they look cool . Now I may be picking at tiny little details and stuff, but that’s because you wanted me to be well critical or w/e and you had to go and ask me to do it on a god damn masterpiece. Ok well I see another thing, I assume he is supposed to be sitting on the mushroom, because atm, he looks like he’s holding himself in the air with one hand, the images apart from his hand just aren’t interacting enough, maybe crumple lines on his clothes or something I don’t know. I think your main downfall is being a lazy mclazy pants XP clean up your lines on the grass and stuff, just run quality control on it before upload or ask someone else to *waves fanatically* Oh one more thing this picture could do with: fingernails ^^

OKAY, I think that’s all the complaining out of the way if I spot anything else, I shall let you know. Now what is good? Well nothing really. Nah I’m kidding okay, you have used shadows excellently here except for the previous mentions of misdirection and also in a few size miss scaling, but they add so much depth and life to your picture, depth which has been previously majorly lacking in your work, so good job there Your recent use of interactive backgrounds/backgrounds which actually do/are something is a very welcome addition, and in me at least the extra effort or whatever is noted. I love your use of textures, I know it’s just a click but it makes them look nice XP The separate layers for grass, a simple but effective device again adding depth to the picture, good, good, good! Ok so the majority of what I was going to say just got lost as I was doing about 5 things at once so I apologise =S

Based on what I feel your ability is I give this an 87% overall due to your laziness and a few blatantly obvious mistakes, although they are little.
Colouring, 4 out of 5, the reason it’s so high is because you have excellent choice in colours and schemes etc, minus 1 because your LAZY and don’t take enough care over it

Lineart 5 out of 5, I just love your lines lol and those leaves don’t appear to have lines so I’ll let you off on their wavyness.

Idea 5 out of 5, you took a concept and made it special.

Use of shadows 4 out of 5, I just can’t let that lil blunder go XP (you’ll probably turn round and prove me wrong by saying, it was caused by the smoke or something, if that’s the case I apologise)

Style, effects and layering 5 out of 5, simple yet effective style, good use of layers (SAI does have layers doesn’t it? I can’t remember) and just general extra touches you added make this piece very nice.

Anything else I can think to rate 5 out of 5 cos I’m tired of this damn thing now.

P.S. you better damned appreciate this half arsed attempt to critique this, I had to buy a membership!