Hey guys, i bought a canon 550d the other day after being inspired by some encouraging results with a point and shoot on the 11th. I have been interested in photography but only have a fairly rudimentary knowledge of cameras based on working at a hock shop

So i guess im keen for some critisisms, and can anyone help me with a few questions?
What are the lines coming down ( from venus especially) in the lighthouse shot? len artifacts? Can they be reduced?
Also i seem to notice star trails at even 6 second exposures, or am i just wobbly?
TL;DR more conjunction shots