Well for a starter, its actually pretty good so props there

Im not a professional spriter myself but i would like to take the time to give proper criticism and show you proper spriting from my perspective please
1 - Too much colors
Counting and Scanning every pixel of your sprite, i found a total of 9 green colors and 7 red colors on your Strawberry crown. The problem was not the amount of colors used but the difference of Lum/Light between the colors (The difference was about 1-20 per color). Don't use too much colors. If you do, the difference in light between the colors shouldn't be low. Heres a color example of proper lighting:
http://img821.imageshack.us/img821/3701/paintcolors.jpg (Unsupported image host)
(This is the lighting in a painting program)
116 (My basic color)
86 (-30. The second color)
46 (-40. The third color)
16 (-30. The outline)
2 - Shading perspective (Im not gonna touch alot upon this since you know)
Each view should have a proper shading. The front view of the Strawberry crown's reflection came from the side rather than the front.
3 - Symmetry for the Front view
The base/bottom part should be equal in size for the front view. Same for the back (not the leaves)
4 - Detail
For the Leaves, they felt a bit roundish. You should've spiked them up a bit
5 - Improvement
I took the time to edit/improve your Crown Strawberry
http://img823.imageshack.us/img823/254/crownpy.png (Unsupported image host)
Reduced all the amount of colors to 4 each. Added the strawberry seeds (it was only one yellow dot but it could've been improved much more xD)
I edited the detail to the leaves and fixed the sides/bottom of the strawberry base. I then re-shaded the entire sprite
If you don't like it, i totally understand. However, if you wish to use it for study of spriting hats or for your full strawberry crown: By all means, feel free to. I do not wish to take credit for it but its appreciated if you could give me partial credit if you ever use this.
Im not here to showoff any of my spriting skills. I just want to help others accel in spriting (even though im not the best spriter around). I hope this helped you Rok
~Maikeru