A Party For Fluke Tutorial

I've been requested for a tutorial by a few friends before. Now my first 2 years in deviantART has passed, and I think I'm ready to make some tutorials. This work "A Party For Fluke" was made in Photoshop CS3. By the way, I'm a self-taught artist. The process of my photomanipulation may not be the best method, and my English isn't perfect. However, I hope this tutorial is understandable and useful for somebody somehow.

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CREDIT :
www.bigbonebulldog.com for the image of Fluke the bulldog. [link]
for the cat [link]
for the rabbit [link]
for the two chipmunks [link] [link]
for the butterflies [link]
for dragonfly > [link]
for the cake bowl [link]
for the daisy field [link]
for the background [link]
for the bubbles [link]

See the finished work in bigger size here.