I will not discuss the placement of the physical features, since, as you say, the map is a pretty random experiment. I will focus on the aesthetical point of view of the physical features; if as I think, the gray features you have drawn are mountains, well, they seem more ditches than mountains. Also, the relief in the “Iwo Jima peninsula” doesn’t look like a ditch but seems surrounded by a ditch.
And the other two brown reliefs …mmm…I can understand they are reliefs only by the brown colouring, not else.
So I think you should firstly rework a little bit your reliefs.
The forests maybe need some better blending with the terrain; as for the rivers, not a real expert here, but two rivers merging only at their delta, and a river splitting in two rivers, like that in your map: I don’t think they look really natural.
You know, as you said you’re a virgin and loosing your mappic virginity isn’t always a painless thing . I think you’re on a good road; only, you need some more time experimenting and maybe reading the tutorial section.