Your photobucket link isn't working for me. That said though, I was reading that if you need task lighting, find the square footage of that specific area and multiply it by 2.5. So if it's about 8'x4' (averaging 45-51" depth) that's 32sf so you would need 80 watts to fill that space with task lighting. By that theory, two 40 watt pendants would work, or you could do 3 (one over the sink and two others closer to the corners of the island).

Do you like monorail track light? The flexible kind could be curved to complement your island shape. You could use regular heads over the prep area and hanging pendants over the seating area. Most mini-pendants can be adapted to work with track.

Here is a link that might be useful: an example of a product from a quick google search

I have a large asymmetrical island that snakes through my kitchen. My cooktop is in it as well as two very large prep areas & a raised bar area that runs the entire length. It is approx 136" x 42" wide (including the raised bar). I have 3 pendants over it. They are halogen 60 watts. They are positioned in the center of the 42 width, so you don't throw a shadow on your work surface when you are working or seated at the bar. They work great for me. It looks good & most importantly, they are dimmable. Opt for a higher wattage light with a bulb that is dimmable. You'll like that feature. As I've aged, I seem to need brighter light to work with, but it's still nice to have the dim feature for mood light. Hope this helps.