The last photo is out of focus.
For me they are "just" pick from spider mites. The red one could be galls.
Usually there is nothing to worry about it. The leaves are still green, so plant will not be much affected.
On a tree, it is also difficult to handle it.
The usual rules: check it, but do nothing. This is usually the best solution. If the situation will be much worse, you may use an insecticide. But usually it is much better to let nature to control it. Rival insects usually will keep control on that. The problem: it you use too many insecticides (and fungicide) you may kill the rival insects, so the situation could become worst, so more insecticides and so on.
On vineyards and orchids, some additional plants are sometime used to keep the rival insects (e.g. roses). But on gardens this should not be needed (you should already have many different species).
Note: both spider mites and antagonists could live in many different species. This complicates [you should spray all vegetables] (and it makes also easier [antagonists should be nearby]) to fight them.
