Thats all i need but the software is expensive help please.
Look at The Gimp. It is completely free, and I believe it uses the same downloadable brush sets as Photoshop.
GIMP - The GNU Image Manipulation Program
Or even better, Krita - if you need good masking and excellent painting options (better than Photoshop). Open source and free.
For Windows: Krita Digital Painting
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