You´re using only Flat Colors which ends up in a total loose of Details. Watch the 3DMotive.com HandPainted Sword Tutorial and then Paint your Weapons again. Gazu
These need alot of work... What you have is fine for a blockout of major colors, but you're lacking shape, form, and lighting... Pretty much the essentials in handpainting. For metal, start with a dark color of your metal and drop that down as a base, add some general AO and lighting, then start worrying about the smaller…
As a guy that works on mobile games professionally, I want to say just because its mobile and there is less detail seen, doesn't mean the quality or talent behind the assets have to be low. It seems like you started this thread as a means to validate your work as its "only for mobile" anyway. Making low res textures for…