You should really look into the basic Butanese bow. Theirs are very simlar to this but with bigger bamboo and tapered tips. Also look for something to put on those tips of the arrmes, spent pistol casings work well or you could get a dozen steel blunts from 3R archery for about $5.
 
If you are also looking into the 'quick bow' area. Check out The Backyardbowyers videos. He makes bows from pvc and the youth recurve cost about a dollar and can be made up to 50lbds. And it can also be made in a mornings work.

Quote from Mauro Fiorentini on Jul 26^th, 2012, 11:35am:

 
Here are some pics,

 

 
Handle

 
The arrows are not the best, but they work for now. I'm still going to buy fieldpoints and shop arrows

 
And heres a little quiver I made from pvc,

 
I also forgot to say, the bow is 60 inches long.
 

Quote from Mauro Fiorentini on Jul 26^th, 2012, 11:53am:

 
Well not really, I guess it's somewhere between 20/30 lbs. I don't have one of those bow scales, will buy one sooner or later

When do you start with yew? It's only fitting.

Oak was used by the North American Indians.. i have a 50 pounder homemade oak crossbow.

In my youth my father made bows to me and my brother from old bamboo ski poles.  He alwys bought old ski poles from flee markets, just in case, so...   He split them, and cut them in different lenghts and lashed the parts togeter so they ended up thick in the middle and with tapering limbs  I remember those bows as pretty short, but rather good.
 
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This is more or less how the bamboo was lashed together

Not a bad first try.  You'll learn as you go along.    
Couple of hints... Your "fistmele" is too low... That's the distance from the string to the bow when  braced.
 
Also, your arrows would work better with a lighter gauge of dowel....Those are really heavy for such a light bow.    
If you stack up layers of progressively-longer bamboo, you can achieve a nice, efficient bend.
 
 
My first bow was made by my dad, who knew nothing of archery.  However, the original "Robin Hood" series with Richard Greene was on TV and I wanted one desperately.   So, he took two pieces of 1" X 1/4" trim material and taped them together, and we made a string from an old piece of fly line.
Thing only pulled 20 pounds, but I got pretty handy with it.  
Used to buy arrows one at a time from the local hobby shop for about 75 cents.   If you shoot the same arrow over and over you learn where it hits!

Quote from perpetualstudent on Jul 26^th, 2012, 3:54pm:

 
The bundle bow is still on my to do list

Instead of making a "true" bundle bow, just do what tinmann suggested. It's essentially an improved bundle bow, only you'd be nesting the split bamboo instead of lashing together multiple clylinders thus giving it an even but more powerful curve.

I really like the fact that your quiver strap is a sling

Quote from benkolmer on Jul 27^th, 2012, 7:07pm:

 
Yeah I didn't have any other rope so I thought an old sling would do the job.
The quiver is not the best though, I made it a bit to fast and didn't put much attention into it
I use a different quiver now

http://www.youtube.com/watch?v=tWzSaNm0K8I&feature=youtu.be

Quote from Jauke on Aug 1^st, 2012, 7:16am:

 
 
Yep. A bow without an arrow is just an evenly bending stick. The arrow is a big componenet in effecient archery.