He has a very nice comb on him, though the blade could sit closer to the head curve, good leg color, too. Chest is pretty nice. His tail barring, like those of my own like, is very darkly barred, but that is good for breeding pullets, especially--makes for better tail-black on them.
Is he brassy from mud or does he brass-up that way? That is one trait that some have, the tendency to do that. Mine never did, thankfully. But, if you feed them too much corn, it will yellow the plumage, too. Ours occasionally got into the Georgia clay and could not groom on the back of their heads, but it disappeared when they were clean.
To properly breed Delawares, you really need a male and female line because some make good males and some better pullets. I didn't do that. No interest in going that far. Isaac passed away in 2015 at almost 7 years old, from breeder Janet Holtman, who was using Meier and McDaniel in hers, plus I think he had a little Sandhill Preservation as well. Yours looks like he could be related somehow. Temperament was perfect. I only have one hen left of that breeding pen and she will be 9 yrs old in February.
And in the SOP pose at just 15 weeks old.