For reference I thought I'd make a list of relevent artists I could like at for the different tasks I need to complete. That way, I'd have different styles to look into and see what suits the work best. Most of these will probably just be personal favourites:

Character Design:

I had so many links open for this section, but I think I've narrowed it down to two that get my point across very well. I think being able to work for either of these companies means that you are a genius with character design:

Massive Black: Their work ranges from realism to extreme stylised. It's relevent for all sections content (characters, environments, etc.) but the originality in some of the characters is good for reference. They also use a variety of media, classic and modern which shows that pen and pencil or watercolour are not dead yet.

Imaginism:

Perhaps the complete opposite in style to Massive Black, these artists use of lighting and detail really captured my attention.

Costume:

John Staub: There is true originality in the costume design in all of his characters, so I think this would be more relevant for looking into interesting costume design, but also good for character design. The layout of his work is simple and easy to read.

Creatures:

Aaron St. Goddard: I would say that the work on his website is relevant for reference in all areas I am looking into, but I found his creature design particularly interesting. He creates improbable characters and creatures that still make sense in their own right. It is possible to see their skeletal structure and to imagine how they grew and developed. I find that quite an impressive quality to get into ones work.

Environments:

While I would have included many of the above for my favourite environment artists, I have a new favourite to include as well:

Oliver NePaul Wilson: The use of vibrant colours and quick strokes get movement into the landscape, and there is an fantastic use of colour to indicate emotion and theme in his work.
Tech and Vehicles:

Doug Chiang: His work is impressive when it comes to tech because it is possible to imagine or even see how each of the creatons would work, just through a sketch. The delicate and precise lines show the quality of technical drawings or blue prints for technology that actually could be created, but is far more imaginative and vibrant than anything that already exists, or probably ever could.

Mudbox:

Judd Simatov: Whilst working in both digital and traditional media, he shows both character and history in his models.