Speed Painting of Creature for Lost World

I am trying to build up a bestiary for all the creatures I am going to include in my final pieces, some sort of well where I can just pick up illustrations and work them into my landscapes. This is the first, with some t rex influence. In the end I feel it looks like a chicken.

Research for Final Illustrations

As I was browsing through the net for pictures related to my book, The Lost World, I fell on these wonders called "Tepui" They are rocky formations found mostly around Venezuela. Tepui means House of God in the native language of the Pemon, the local indians living in the Gran Sabana. The Tepui is an abrupt plateau, and is very impressive to look at. The most famous, and I believe the largest is called Roraima. Here are some pictures:

This last one is my favorite, one of the most impressive shots I have ever seen. I hadn't read my passage yet when I found these passages. After reading it, I was pleasantly surprised that the author had set his story on these impressive formations. I had been a bit reluctant to throw myself completly into the idea of a plateau in the amazon, but then I hadn't been thought that something so epic could exist. This perfectly fits the vision I have in my mind, now it is for me to reproduce those ideas onto paper.

Quick Speed Painting 20 minutes

A quick drawing I did in about 20 minutes, showing some canyons with an emarald river going through them, and tiny canoes carrying the expedition closer to its goal.

Floating Rocks and Plateau Concept

I don't like this one too much. I am having trouble reproducing scale on a large level. The rocks all look like pebbles, their is no sense of depth. I need to work more on the textures to increase the detail, and therefore increasing the scale.

This represents the expedition walking through the mountains that lead to the plateau, and as they walk through the mystical landscape, they come across a giant dinosaur hunting around the floating rocks. I have made a few initial shapes to try and get the right pose, all comments are welcome.

So here is some work in progress:

 Blogger is really annoying me with its lack of precision when placing pictures.

Here is some of the beast sketchs:

C&C welcome.

Forest Concept

Here is a quick sketch of a what the expedition could possibly see when arriving towards the plateau, barely visible through the heavy mist. This is very early idea, so it is still quit similar to what could be found in the real world with no real design innovations. The dinosaurs are included to stay true to the original text.

Here is the development. I started with a quick defining of the mountains, added some textures to created a the flora, added a white gradient on the top and then added quick drawings of pterodactyls.