Hi, i need help painting these types of rocks, i have tried various photoshop rock brushes but with no luck, every time i try and draw them they dont look even close, they end up looking way too smooth and not enough value to make it appear good enough.
i could paint every rock one by one, but i really dont have that kind of time. So what would you do to get that the impression of the rocks without spending too much time?
I would break the form down into big blocks of light and shadow, and work out the most general composition of the piece.
Then I would add some detail and suggest enough texture for the rocks to read as rocks. But not too much detail, so it does not look too "worked".
However, what tools you use is completely irrelevant to the method. You can use Photoshop and "rock" brushes, you can use pencil and paper, you can use ketchup and tortilla, it changes nothing at all. What matters is that you understand what you are doing, and are not expecting a dumb tool to do work instead of your brain.
TL;DR: don't expect magic from Photoshop brushes; they are not a replacement for real painting skill.