Good work!

First your model topology looks much nicer.

I like the changes to the foot.

Your seem placement might be noticeable but overall for your first try at UV mapping I have to say good job!

Suggestions:

1. grab a UV layout texture grid (just use google image and search for "UV layout texture" and apply that to your model to see that the tiles are not distorted and are about the same size.

2. As for texture painting that is another tough topic. It requires some degree of artistic talent (which I sadly lack). To understand the best work flow for color, bump, spec map painting you might want to google for some free tutorials.

As a general first cut you might want to search for highres images of elephant, amphibian, crocodile, hippo, etc. skins and apply them in photoshop. You can use the desaturated (black and white) color map to create the bump and spec maps.

Keep up the good work!