Hey Subatomic,
you asked me to give you some feedback, so I'll try my best.

The ice layer from the tutorial is meant to whiten the edges of continents, not for creating arctic continents, but Ascension already got you covered there, so all is well.

While I personally think exaggerating land features for a map is ok, don't forget your scale altogether. The volcano crater lake is more like a huge meteorite impact site at this scale.

The rivers seem a bit random. They should follow depressed areas in the land upwards to look more natural.

You used grass very sparsely. This might be entirely intentional, and if it is forget what I'm saying, but some more would help to smooth the transitions to the forests.

The mountains could use some more emphasis. This might also be intentional, but it's a bit difficult to see where they are.

Islands and continents always are on top of underwater shelves and ridges. A good example where it looks really off is your central ring of islands.

Don't forget you can play with the adjustment layers on the top of your layer stack. Maybe try just a little bit more contrast.

Of course, all these comments are just suggestions. It's your map, after all. I'm just posting my thoughts.

I hope this helps, and have fun mapping. I'm looking forward to seeing where you take this.