Some Photoshop Worksheets

I'm using Adobe Photoshop CS6 to editing photographs and pictures. It's just a hobby. So I have been engaged in this for a while tonight. I've created a logo for this blog, instead of current simple logo(I will not change the current one for now). I'm not sure it's a nice job or not. Because I haven't been interested in Photoshop for a long time. Therefore I was worried about this. I think it's not that bad although it is the first worksheet after a long break. It's definitely necessary for improving my photo editing skills. Thus, keeping go on!

PNG version | JPG version

P.S.: The atom logo isn't copy. I made it on my own(not a big deal, simple).