This is Apollo's 8 week update; the top photo is week 1 and the bottom is week 8. As you can see Apollo' foot looks more symmetrical. The back of the foot is further back and wider and as a result is giving him more support.
The collateral grooves are deeper now, showing that his sole is becoming thicker; the ridges around the frog are usually a sign of a weaker sole which needs support and I would expect these to disappear as his foot becomes stronger.
There isn't much to see here as the feather makes it hard to compare digital cushion and heel depth; there is little obvious change from the week 1 photo apart from it being shorter.
In Apollo's week 8 photo his foot is more symmetrical which shows his medio-lateral balance has improved. His frog is also more robust and he has a shorter toe.
Apart from Apollo's feather being long you can see that on his week 8 photo his heel is shorter and wider compared to week 1; his week 8 hooves are giving more support.
His footage is here - chart the increase in feather(!): https://vimeo.com/370695504