looks like you have a pretty good understaning of PS . Looks okay. I'd say work on current styles more take a few tutorials and try to learn more about the trends.
Your colors arent bad in 2 and 3. The placement in all of them seem liek they need a bit of work, try to remember the rule of thirds, it will really help you get a more interesting tag.

Blending seems okay and effects are decent. Just work on flow and coloring for now, soon maybe more into different effects or something. GJ