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- a render is when you have an image and you take the foreground out of the its background. and latter add effects , lighting or colors to it. i don't know what do you mean about why they are so large in size, because it depends on the render size i guess.
- about brushes, you always need an external brushes. because the brushes that are built in with photoshop are so limited. so you always need to find new brushes and add them to your collection of brushes to get a new designs every time. and you can edit them from the brush options and change their size.
- of course you could use images from outside photoshop, like personal photo, nature photo, anime images, logo or anything you want. just drag that image and drop it in the workplace, or from file> open.
- you can enlarge any image or photo in photoshop without loosing its quality. i don't know which version of phtoshop you use, but i use photoshop cs3, and you can enlarge images from image> image size and set the desired size for your photo.
hope i could help, and good luck.
That was a nice and quick explanation. Thanks

I've been watching more and more videos about Photoshop and am beginning to understand a few concepts in detail now.
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''Render'' is actually inappropriate for what it is applied to. In signatures, wallpapers, and similar designs, ''renders'' would be the characters or objects that the signature is using as the basis for its design. The reason why i find the term ''render'' to be inappropriate is because these images were generally not rendered, so to speak. Something rendered in, for exmample, Blender, or Maya, or Cinema 4D, or 3DSM, et cetera, that is a more appropriate reference for the term. ''Stock image'' i would say is more appropriate for what is often labeled a ''render.''
I found the use of the word
render a little strange too. And I'm sure I've heard of "stock image" earlier as well. Aren't there entire sites dedicated to it?
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I saw an advertisement for some new software/technology that can enlarge images with no (or minimal) quality lose. I think it had something to do with fractals? I don't know. If you really need to resize an image you could look into it. It wasn't a part of Photoshop, it was software dedicated to enlarging images as far as I know.
Well there are lots of site claiming to resize images without quality loss too, but when I tried them they never worked well. Maybe for very small images there is no proper way to do it on a computer?