I know shapes are highly interpretive, but your latest Juniper pipe is a classic pot, with its low cylindrical bowl. Bulldogs have the bowls that angle out to the center, often with a bead line, a little double groove, around the wide part of the bowl. Also, a square/diamond shank is standard. Spend a little time with two or three shape charts, and then go online and look at traditional shapes. Occasionally even the pros get them wrong, but mostly not. You're doing some interesting work, but you need to know the fundamental traditional shapes.