Time to shade.
The Cutout Effect: select the area with your magic wand
(mode: add, match mode: RGB Value, tolerance: 0, and important contiguous is checked).

For the Drop shadow effect, select with the magic wand, go to Selections > Invert and then effects > 3D Effects >Drop shadow.
note    Ctrl+D on your keyboard to deselect
The colors I choose for shading are not always the one I use for the outline,
  :-D

1  prickles (on left and on the head) adjust > add noise gaussian monochrome 10% do not deselect	2  invert the sélection 3D effects drop shadow vertical 0 horizontal 1 opacity 100 blur 8 color couleur #694E3A Ctrl+D	3  prickles (under the arm on the right) adjust > add noise gaussian monochrome 10% do not deselect	4  invert the selection 3D effects drop shadow vertical 0 horizontal -1 opacity 100 blur 6 color couleur #694E3A Ctrl+D
5  stomach (all) 3D effects Cut out vertical 0 horizontal 0 opacity 100 blur 8 outline #DE9E94 floodfill #F9EBDE do not deselect	6  invert the selection 3D effects drop shadow vertical 0 horizontal 0 opacity 74 blur 3 color couleur #463722 Ctrl+D	7  arm (both) and feet (both) 3D effects Cut out vertical -1 horizontal 1 opacity 100 blur 10 outline #D4887E floodill #EECFB3 Ctrl+D	8  the head (all) effet 3D découpe vertical 0 horizontal -1 opacity 100 blur 9 outline #DE887E floodfill #EECFB3 do not deselect
9  invert the selection 3D effects drop shadow vertical 0 horizontal 0 opacity 74 blur 3 couleur color #463722 do not deselect	10 The head is always selected add a new layer two white pixels for the cheeks adjust gaussian blur radius=0,7 Ctrl+D merge down	11  it's important to work on a new layer over, so that colors doesn't overlay	12  center and interior of the ribbon 3D effects Cut out vertical 0 horizontal 0 opacity 100 blur 4 outline #DC3852 floodfill #DC3852 Ctrl+D
13  rest of the ribbon 3D effects Cut out vertical 1 horizontal 1 opacity 100 blur 10 outline #DC3852 floodfill #DC3852 Ctrl+D	14  mallow'yellow part 3D effects Cut out vertical 0 horizontal 0 opacity 100 blur 10 outline #F5F16D floodfill #F8FCC8 do not deselect	15  effects > plugins Eye Candy 3.1 glass Bevel Width 20 Bevel Shape Mesa Flaw Spacing 30 Flaw Thickness 30 Opacity 50 Refractation 24 Hightlight Brightness 100 Hightlight Sharpness 40 Direction 135 Inclinaison 45 color="#F8FCC8" Ctrl+D	16  marsh mallow'green part 3D effects Cut out vertical 0 horizontal 0 opacity 100 blur 10 outline #45782E floodfill #8FCA74 do not deselect The plugins effect (Eye Candy glass) is the same than before except the color, now #8FCA74 Ctrl+D
And last, save as *.psp image, then edit > copy and past as a new image, so that your image is resized and you can export it as a gif optimizer.

Your creation belongs to you! and you can do what you want with it, but you can not offer the outline on your site nor sell your result. This site is free so whatever you create can only be offered for free