His chest is as wide as his arms are long. When you touch your shoulder with your other arm, is your arm stretched? The arms should be a lot longer. Try looking up the following book (can be acquired freely all over the internet, both legal and illegal).
Andrew Loomis - Figure drawing for all it's worth
Page 28
Heroic Proportions
Arm length is about 4 heads from shoulder to knuckles there, you have arms with a length of 2.2 heads. The forearm should be about the same length as the distance from the belly button to the chin.
