They both have awesome colour choices and the flow works really well, IMO, on both sigs. The BG's are great for first efforts, well worked with both of them! Maybe try sharpening the BG before adding the focal to give it more impact though.
The first one lacks a bit of and definition on the focal, maybe a soft-light, black & white gradient map clipped to it would have helped and/or a duplicate of it underneath gaussian blurred? Just an idea, or as jsmizzyy said brush over and around it.
Can't fault too much on the second one because I really like the style and the idea of it. Maybe resize the duplicates of the focal in the BG and lower their opacity a little bit more, that would help the focal out and again work on the lighting, try gradient maps of a curves level
Throw a simple drop shadow and maybe a gradient overlay on the text too and I think that would really boost both sigs, again, just my opinion.
Overall though their really good work for first efforts so keep it up man!