.psd file is free, you can use it under this conditions:
Attribution: You MUST attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). This means that you must credit me in your description!
Noncommercial: You may not use this work for commercial purposes.
If you deliberately ignore this conditions, your work will be immediately reported to deviantART.