Good start.
The most important point is, imho, that the coastlines feel natural, you found the right mix of rough coasts and coast-near island groups and smooth ocean shores. The mountain ranges look fine, the tectonics seam okay. - Only the mountain over the water bridge in the central east part of the map looks wiered, I don't like right angles in mountain ranges, but than again tectonics, shore and mountain lines are quite chaotic and there are places on earth, that do actually look weired, somewhere on a planed unlikely formations are going to appear, so that's okay, too.

Climate zones are more problematic: You "forgot" the tropic belt. There is just subtropics around your equator, temperate climate around that and then the polar caps. if you did this willingly (temperate zones are the sweet sports for the most interesting political and cultural parts, so making them bigger than likely is a good thing), than it's okay. But reasonably, the part in the middle of the map would probably look like Brazil at least, the southern coast of the inner sea north would border desert where there is the middle green now and the southeast continent would have more savanah-like climate between the mountain ranges (maybe, the mountains there could result in strangeness)

Style: It's a start. The color composition looks good but the textures are not exactly a harmonic map. But I'm not the best to give advices here.

And a very special point :

File Format: Really? BMP? Use png, if you don't like jpegs.