Hello, Kindly advice me.

[telloirishanne]

I am new to being a graphic designer and eager to learn more. I am making my portfolio, can you give me advice on what i need to do more or improve my work. 

Your help, means a lot.  Thank you!

[Myra Ferguson]

The top examples look great. Unless the 3D mockups should appear to be floating, they look like they're missing a shadow in relation to their background or ground plane.

You might consider adding your images to https://www.behance.net/ where you can describe your process, get more feedback from the community, and also look for jobs (https://www.behance.net/joblist).