I give in-depth critiques in the 2D WIP forums here at cgtalk, so if you want detailed feedback, you should post in the 2D WIP forum. Also, the more information you can give about your image, what your goals are, what you want to convey with your image, etc, the easier it would be to give you feedback. Take a look at this thread:
http://forums.cgsociety.org/showthread.php?f=31&t=1020800
As for finding your own style, that’s not something you go out of your way to do, and this is true for all creative endeavors. What actually happens, is that your style will find you on its own. Also, you need to think carefully about what style actually entails.
When you say, “Every image looks like it has been painted by someone else and not by me, and that’s what makes me questioning myself a lot,” what you’re actually talking about is actually not one single factor. Let me explain.
In a typical sci-fi/fantasy type of image like the ones you like to do, there are actually multiple factors that contribute to a style:
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The narrative/emotion/idea being portrayed. This has nothing to do with the visuals and it’s all about the creative idea behind the image–the visual storytelling, the mood you want to convey, and the emotions you want to express.
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The general stylization, which is what separates styles from each other such as anime, Disney, realism, children’s cartoon, American comic book, Korean, etc. This includes the overall proportions of the characters, how the features are portrayed, the level of simplification or detail, how much idealization, how much exaggeration, color choices, manipulation of values, and how the forms are modeled (angular with facets, smooth gradation, etc).
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The execution of the brushwork and/or line quality (rough, smooth, expressive, mechanical, etc).
The only way to find your style (or like I said, let your style find you), is to clarify the above elements for yourself. Ask yourself exactly what fascinates you and what your preferences are, and then let your natural biases lead you.
Think about visual stories and emotions and ideas that really resonate with you personally. What makes you happy, sad, angry, indignant, lonely, etc? What are your dreams and nightmares? What are your regrets? What are you ashamed of? What are you proud of? What poignant moments in your life that you would want to tap into for visual narrative ideas? Your first kiss? Death of a loved one? A betrayal? The happiest day of your life? This is how you find your own creative vision and voice–by looking inward into who you are and what you want in this life, and then combine it with your imagination and sense of curiosity.
Once you have the idea that you want to turn into images, the rest is simply matching aesthetic sensibility to the subject matter you want to portray. And that is how your arrive at a style.
Also, being exposed to a wide range of different styles helps immensely. If you only pay attention to a few styles that everyone else also knows, then of course you’ll end up regurgitating the same stuff, because your range of influences is so narrow. If you have a really wide range of influences, then you’ll be assimilating from more diversity, thus resulting a more unique hybrid that is your own style.
Go and explore the much bigger world of visual art outside of your comfort zone. Look at 19th century art movements, the golden age of American illustration, Folk art from different cultures, European comic books, Korean Manhwa, American underground comics, contemporary fine art painters, etc. I have a list of my favorite artists and why I love their work, available on my website. You can take a look–I’m sure you’ll find many excellent artists that you never even heard of before, and I bet you’ll find at least a few of your new favorite artists from that list: http://www.ethereality.info/ethereality_website/about_me/influences.htm#favartists
- Having knowledge outside of just art is also very beneficial. If you explore subjects like biology (insects, marine life, mammals), history, engineering/mechanics, astronomy, industrial design, architecture, photography, etc, you will gain lots of interesting insights and inspirations that will further inform and shape your style, and make it richer and more sophisticated, as well as unique. The more you understand the world you live in, the more interesting your artwork becomes.
You might also want to read the threads linked here: http://forums.cgsociety.org/showthread.php?f=166&t=844409
They contain posts that really help in altering the way artists think for the better, helping them advance in their artistic development in a healthy, effective manner.