Sure thing. I only use photoshop so many images were used. Such as the room lightbulb and landscape. But I changed colours, reflections and added things to each of them. Like the string and some trees to the landscape. The clouds were brushes manipulated somewhat. SO to be honest. It ISN'T that hard. Once you understand lighting. Many of your works will look SIGNIFICANTLY better.
Anyway onto the examples.
For instance, In my scrap book I have a photo of an icy planet
[link]It was a test for planets
. The texture I used to create that planet was a 5400px x 5400 px image. When making planets high quality/res satellite images are very useful. Ill explain how to make planets later.
Secondly lighting. IN SPACE ART. The shadow of planets are VERY important. Another thing that makes good space art. IN MY OPINION. Is the amount of stars. There are usually a low amount of bright stars as you will notice in most awesome works.
This is what I had trouble with the most. More stars does not equal a good space background.
Space dust is another thing that influences space art. Usually "space dust" is used to add something to the lonesome stars if there is nothing else present.
Make sure to make use of masks, masks are very useful.
1) Making planets (what works for me, after all I am just a hobbyist
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First I would find a nice texture (yes a large texture is good) with a good variability with land and sea, or ice and sea.. it really depends on the planet you want.
Next paste it into photoshop. Try get the largest circle selection of the part you want.
Next, copy your texture in the circle and paste it into a new document. After you have done this, DONT move the circle. Just go filter --> spherize and do it twice or more depending of what you want.
Now you have your planet texture, it may actually look "good" for just that much work so far. So well done
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Now for the more important parts. Resize your planet to whatever you want.
Now on ANOTHER document (This one will be where you put your stars etc).
Make some stars then.
Make 3 new layers above your planet layer. NAME your layers as atmosphere and shadow.
Select your circle of texture and go to your atmosphere layer. Fill it with black. So basically now you should have the atmosphere layer with a black circle covering over your planet texture.
Go to layer styles, outer glow, inner glow. Make outer glow to however much you want it, and change the colour to whatever you want (I like to use light blue). On the inner glow part, increase the spread and size to quite high.
After this, put your layer on screen. So up until now, it will be a black circle with inner and outer glow.
For your shadow, select the black colour and go to the top left, make sure it is black to transparent. From this go to gradient and go to your shadow layer. (You should have your circle selection, so basically a selection with nothing in it, as it is on your shadow layer). After you have done this, make a gradient and change the opacity of the layer if you wish. There you have made a simple planet.
TRUST ME, it is ALOT faster than typing it all out
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Well thats just for now, maybe you should try a little bit and see what you get.