Ice cap melting would be one solution to that yes :p I would try to think about possible tectonic plates and how those would affect your land masses. They look a little random but maybe I'm just a crazy person. Actually, I think water levels are all very relative since they change over the millennia anyways. If you look at google earth it's really interesting to look at all the land masses that we would have if the sea level went down significantly. The coast of Africa for one would have a lot more islands. Small islands really are just mountain tops.
My only advice at this point probably sounds strange so let me preface what I currently see. Right now your coast lines are very etched and dynamic with lots of bays, isthmuses, and islands which is actually fantastic. The most boring kind of maps have very coastlines nearing circular blobs so you are absolutely on the right side of that! I'd suggest actually relaxing the jaggedness in some areas and smooth them out a bit. In the real world you do have areas like Greece, Japan, Indonesia, and I guess the whole of the Mediterranean and Caribbean which have lots of little bits to them and are very dynamic. On the other hand you also get areas of regularity and broader shapes, such as: the western bit of south America, much of the coast of Africa, much of Australia, India and south east China. All these areas on the small level have lots of jaggedness but from afar are smooth shapes which are not too interrupted. Let yourself have some generally larger shapes too.
I guess I am trying to say have dynamic shapes on the medium and lower scale but also on the larger scale. Try having a continent that looks like banana, crescent moon or a pear and have some coastlines be highly broken up while maybe on the other side the coast is more smooth. Again looking a Turkey, its southern and northern coasts are smooth but its western one is all chopped up. If you allow for a larger mass of unbroken land you could imagine a larger desert or plain situation being there. This advice can also be applied to continent spacing, placement and relative size. Your north and south landmass groups are similar in size over all.
This is a LOT of writing but I don't think your map is off to a bad start or anything and I actually like it! This stuff is to a degree all a matter of taste as well and I find myself overlooking it from time to time. I hope do you get what I'm trying to convey here
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