Negrito Elegant Rocket Dock skin

I really like it. The icons are clearly the work of a professional. However, I don't see the over-arching 'theme'. They are all individual, high quality icons that show a great deal of skill and of course they look very nice indeed but... and there is a but... I can't see the single connecting element that links them all.

A theme connect the items so that they all look good together, yours look good individually but personally I can't see the theme. I created a series of steampunk icons myself and even though some of the individual icons aren't as high quality as yours, they sit nicely together and convey an immediate impression of togetherness. Everyone who sees them knows what the artist is trying to convey, I am unsure what your icon set is trying to convey.