Beauty is in subtle details:

Sometimes a lot of people tend to forget in their textures are subtle details. These are things you don't notice at first glance, but make a texture or object interesting to look at.

Depending on the style and theme you can use a minimalist style, or go to extremes with the detail. It is your job to give the viewer something interesting to look at. Subtle details are perfect for this, and they can be everything. 
A sticker, some worn paint, rivets, bolts, someone that wrote something with a black marker, mud, oil, anything. But the key is to keep it subtle. If you go overboard with this, it'll lose it's power.

check out this link for some stunning artworks:http://stefan-morrell.cgsociety.org/gallery/259370

3 tricks to Kick Start your Artwork

 This is one of the artwork that I have worked on,when I was doing my diploma in Animation.As you can  see that this whole artwork is an 3d(dimensional) totally created using softwares like Autodesk maya & Adobe Photoshop.I would be glad to Share with you some tricks to do such kind of artwork with ease.

Getting Started:
1.To start with any kind of work u need to collect enough references,After collecting the references go through it and select the one you like the most,It makes your jumbled up mind to focus on one thing.

2.Now once you know what you want to do , you should make a plan on how you are going to proceed.
Having a plan is the most important thing as it saves a hell lot of time and chucks out any unwanted efforts from you.

3.Once you get your plan rite there's nothing that can stop you from making  a great artwork. Remember one thing there's not a single artist who is satisfied with his artwork and the one who is satisfied is not an hardcore artist.

So get started with your own artwork and explore the crazy 3d world.