First the positives:
Very nice theme idea for the coming Halloween.
The pumpkin was very nice, and quite well drawn.
The sweating effect was very nicely done.
The glass effect, also, very nicely done.
The green background, also, very nicely done.
The strange text effect, with the bevel, and the glass, and the distortions, also very nicely done.
Now, the negatives:
Never criticize another artist to justify your work. Very distasteful.
Never try to align yourself with other great artists. That was the downfall of many good artists. It is similar to The Knack putting down The Beatles, and look how they were viewed.
The image is not centered and makes it sort of displeasing to look at on the desktop.
If this is a Halloween theme, a pumpkin alone does nothing to support the overall theme. A few flying bats, a black cat and maybe a skeleton, would better glorify the theme. As a wallpaper alone, the theme needs to stand out.
Although a very good drawing, the effects do lack originality other than the "sweating look".
Overall:
I would not use it. Because, it is just a very nice pumpkin. It does nothing to really glorify the coming halloween season. The theme is not strong enough just being a pumpkin.
But, it is a very nice drawing overall.If you made a windowblind for this, or/and other supporting skins, I'm sure that this wall would be appreciated. I've seen much less in wallpapers accepted when it was part of an overall theme.
Now, if you had this wall as a logon, and added more to it as the wallpaper(like bats, black cat, and a skeleton), this would be awesome.
My personal overall rating would be an 7-8, in comparison to other wallpapers. Most importantly, DON'T GIVE UP, this is very, very nice.