Base Kit - The extra CTRL is 2.25 instead of 1.75. I don't know of a single board or person that puts CTRL where L SHIFT is, if that was intentional. It is also yellow, and not the dark blue that the CAPS LOCK is. Speaking of caps lock, the render has "CAPSLOCK" instead of "CAPS LOCK" on the main key, and the extra bottom one caps key is also yellow instead of blue? Makes no sense. Secondly, what is the point of having "Hyper" and "Super" keys? Having one of the keys, in this sets case, is good because you can use it as MENU or FN without the need to have both. Also, why are they yellow also?
Numpad- Not a "mistake" technically, but the straight vertical gradient of the numpad would look quite odd beside the staggered gradient of the alphas and mods. Also, it would only fully "match" the Tenkeyless 02 kit due to the yellow top row, the basic kit has a full blue top row, which could also look very out of place in conjunction with the kit. A full blue kit or a staggered gradient would be a huge improvement i think.
Symbol Kit #1 - The 3 novelty keys on the right with multiple colors are impossible to make. Period. SP simply can't do them. Also, the others would need to be designed and touched up more than likely to be able to be made by SP. Why is the 1.5u BS blue? Why is there a blue AND yellow 1u |\ but only a yellow 1u BS? What is the point of having 1.5u bottom row modifiers and not including a 7u spacebar?
Symbol Kit #2-Like the first symbol kit, the last 3 keys are unable to be produced at all by SP.
ISO KIT- Why is the return key blue? Why are the 2, 3, 4 keys yellow? Makes zero sense.