The best advice I could give about arms is that the bicep actually is 2 parts the long head and the short head... the short head is the one you are showing off in that picture the long head is what...
Yeah I can kinda see that... dumbells are a great tool for evening out uneven body parts ... drop the weight on the bigger side and try to do less reps to let the other side catch up!
When I started out I'm pretty sure I made every mistake in the book, I don't think I started training properly until about a year ago, but I havn't got my diet half decent until about 6 months ago :P...