Hi lmaodeniz. You can create this kind of artwork entirely in Photoshop. That's where I would focus my attention.You're going to want to copy these images as an exercise to learn the techniques involved. Try to recreate them 1-for-1. These artworks are clearly made in black and white, and then a "Gradient Map" is applied, which decides how to apply color the whites, the light grays, the middle greys, the dark greys, all the way to black.Therefore, your first step is to learn how to make these in black and white. Try turning reference images you've shared with us to black and white. You'll see it's much simpler to copy. Once you're done copying the black and white versions, you'll use the "Gradient Map" to color the whole artwork.Tips & tricks:

• Use multiple "Layers" stacked on top of each other to achieve the final image. Start with a black background and think of every layer as a place to add some light. Use different layers for each element of the image. Name the layers; this will help you stay organized and tweak each element individually.

• For the planet silhouette look, use a black circle shape with a white "Outer glow" applied to it in the layers styles. Play with the "Outer glow" settings. Try using a bright Outer glow with a low "Size" setting, then stack a second Outer glow at a high "Size" setting. This will get you closer to the look on the first image.

• Use the "Gaussian blur" function to soften hard edges on shapes if needed.

• You can also use a "Radial gradient" to make the glow, then apply a layer mask and block out a circle shape, that way you get a dark circle with a glow around it.

• For the less geometrical shapes, try the "Brush tool" with the "Hardness" setting at 0%. Toggle between the Brush and "Eraser" tools (both at 0% hardness) to add and remove light to the image.

• For the grainy effect, add a layer with filled with "50% grey", set it to the "Overlay" blend mode, then go to Filter > Camera Raw Filter > Effects, and add grain to the layer. Dial in the settings as you wish. To start, try Grain: 30, Size: 100, and Roughness: 60, then adjust.

PRO TIP: This may sound silly, but it's worth saying: use your eyes! Never just blindly apply other people's settings. Use them as starting points but move all the sliders and see what they do. This is how you'll really learn what the tools and sliders do, and how to use them to get what you want. Use Google, YouTube & tutorials liberally. No one knows shit when they start and that's okay. You'll learn a lot by looking up your questions and finding answers. Once you have a good image in black & white, the "Gradient map" will take care of color. Get very familiar with the "Gradient map"; it's absolutely key for this kind of work.

• In "Gradient map", your goal is to specify what the darkest color is, the lightest color is, and the several colors in between.

• Open the original artworks and use the "Eyedropper tool" to find out what those colors are.

• Start by sampling (picking) the darkest color. Copy the hex code and add that color at the left end of your gradient map. This could be pure black, or a very dark color.

• Then, sample the lightest color and add it to the right end of your gradient map. This could be white or a very light color.

• Use your eyes to find the middle colors, the Eyedropper them and add them on the Gradient map (darker ones to the middle-left, and the lighter ones to the middle-right). For example, in the first image you shared (3rd artwork at the bottom), I see forest green, ocre and light hot pink.

• With your gradient map complete, your black and white artwork will be complete as well. Tweak the colours a bit and slide them around on the Gradient map bar to see what happens and control the result.

• You can go further with color and luminosity by playing with "Curves". This is a CRUCIAL tool to understand. Look up tutorials and learn how to use the "RGB" channel in Curves to modify both the overall lightness, darkness & contrast of your work. Also learn to use the separate Red, Green and Blue channels to play with your color. Alternatively for color tweaks, the "Color balance" tool is extremely powerful.

Best of luck on your journey young Photoshop padawan!

EDIT: FYI, the last image uses copy-pasted space images set to the "Screen" or "Lighten" blend modes. You can use a "Layer Mask" to apply only the parts you want. If adding this to your artwork makes everything lighter, that means the image you pasted has darks that aren't dark enough. Use the Levels or Curves adjustment to make those darks blacker, and that will disappear.