Hey @Mariana Santos! Nice work- and happy to see you want to move forward with concept art :) Developing your own technique is a lot of exploring what look you want and how to go about it. That's a lot of personal application so I focused more on practical things you can improve in your given designs. (As you continue to hone your craft your own style will develop anyway as long as you produce art that you enjoy making). I did a paintover with some notes. For character artists I believe the most important skill to hone is silhouette and shape design (but then again I feel that for any concept artist). And of course, relating all this to a story! *I notice your work uses more linework whereas my style is closer to painterly- but the feedback is applicable either way. I definitely recommend looking into Overwatch or League concept art for a nice mix of 2D graphic style and 3D render!

What I recommend is to create a nice library where you can look for inspiration and elements you can use in your concepts. If you want to make a profession out of it, you will be required to create characters and creatures of many different types, with particular cultural backgrounds, that tell something about themselves at a glance. If you have the chance, visit costume or ethnographic museums, but also learn to observe how people dress in the street, what you can guess about a person by looking at how he/she dresses. For things like this, Pinterest is very useful, where you can follow a lot of galleries dedicated to this theme (but also others about natural elements that you could put in a costume or a character, I don't know, a dress that reminds of a particular animal, or maybe an underground civilisation that learned to make fabrics from mushroom cultures - there is a kind of artificial skin made from mushrooms! The ideas are endless!) You can also go to Art station and follow some professional cartoonists to see how they organise the presentation of their characters or how they develop their ideas. In short, let yourself be inspired by everything that already exists, both in nature and in existing costumes, jewellery, various cultures, etc.). Recently, for example, a client gave me a collection of files on ethnic jewellery that she had bought in the 1990s. She was very nice, she found it when she was tidying up her bookcase and thought I might need it, so she sent it to me. When I was a kid, I used to empty out the attics and cellars of people who wanted to get rid of old stuff, to collect picture books and encyclopaedias. Fortunately, now with the Internet, everything is much easier and more convenient. Also watch films and TV series with interesting costumes and make notes on what catches your eye and what you think would be a good solution to adopt. I for example loved the costumes of the TV series The Musketeers: the TV series was not too much up my alley but the costumes (not historically accurate, very fantasy) were beautiful with some very interesting and original details. Also get some video game art books with interesting designs (a very nice one is Orizon Zero Dawn, in my opinion).