You've got good blond beard stuff going, but truthfully I don't think any sort of big beard will be available for you at least at this time.  You've got a great 'stache and chin facial hair going for sure.  Maybe think about a different style such as a Van Dyke or circle beard style.  The other alternative is to put up with a bit of patchiness and just wait for your beard to develop.  I think it will it may just require a bit more time.  If you're able to just let it all grow and not worry about how finished it looks just let it grow for  a couple or three months.  You'll get a better idea on how well it might fill in.  If it turns out that even after three months it's not looking so hot you might opt for the styles I mentioned since I'm betting that for sure you can carry those styles off.