furious - the whole package looks great! To go after a competition you'll need to pull your diet & training together to get the cuts & size that you will need to compete. I'd be willing to bet you won't have any problem with the cutting and you already have some great definition - bis/tris, legs look great. You'll need some more width & thickness in your back and chest. More size in general. Go check out a couple local natural competitions - there seem to be lots in July & August. See what the judges are looking for, the types of posing & routines people do, etc. And also look at the size that the guys get to, but still have to get lean. I'd bet you can get quad striations in no time. Maybe work w/ a trainer to pull all of it together on a timeline for a particular competition. I think the last ones of the year are around Thanksgiving. (That gives you 5 months to prep.) Then there's a break until Feb-March. (Or about 8 months to plan ahead.) You might look for "tested" NPC shows or one of the natural bb organizations like NGA.
If you have interest in a competition, I say go for it - its fun as shit if you are physically ready for it. That first time on stage is the shit if you know you have worked hard for the ultimate body and are ready to show it! The point is to let loose and have fun. I'm also kinda shy so it was nerve wracking to take that first step on to the stage, but the crowds are very supportive of competitors who have worked hard & have the stuff to show.
Good luck!