Photoshop mockups for genesis/wordpress

[protechig]

Hello,
I am a web designer, who focuses more towards coding than the graphic design side of things. I want to start leaning photoshop beyond the basics to create mockups that I can then transfer to html/css and ultimately WordPress with the Genesis Framework. I have taken Lynda.com's Photoshop for the Web Course, but it really isn't as advanced as I thought it should be. Any suggestions on where I can go to learn would be greatly appreciated. Free guides would be good, but I don't mind paying for books etc... I just want to improve my skills and become a more well rounded designer :)

Thanks