Photoshop elf sketch

The concept below has been created by using the 8 heads high human proportion and the perspective drawing hence the heroic posture.

These are the images that I used as reference

 The dwarf is known as being a short creature therefore the proportions are different from the one of an elf. Instead of using the 8 heads high proportion I used a 5 heads one.

Insect concept.
The objective was to create a concept for a character that is like a half human/half insect creature.

The Dynastinae/rhinoceros beetle inspired me to create the top part. It helped at shaping up the overall form into a heavy armoured character. 

 The final concept of this character came out by using multiple learned techniques such as the 8 heads proportion , perspective for the heroic posture and the side and front view for making things easier to explain if the concept needs to be modelled.

Concept of a futuristic tank using perspective and shading techniques

 I started with some simple sketches, on the top sketch I also used the two point perspective and on the second one being a side view.

Final drawing of the tank