Hi Chris
A quick catch up from me...
Metal - Like this idea, I actually like your first image, the green doesn't distract too much for me, I really like the detail on the I-beam end
Captive - A great link to the theme, the light reflecting from the tablet lighting his face is nicely done, captivated indeed
Miniature - The first one for me Chris, such a fun idea of the mound as a mini mountain, liking the bright colours on this one
Happy - Love this one, great pastel colours, good pose and a girl with her phone, pure happiness
Sorry - Didn't realise I was so far behind on yours