İMO it is very large, bare and artificial to be a center piece. Perhaps you should try other ways of placing it or breaking it into two or three parts and make a heap from that and place some moss and anubias within. But by the way I have to add a few commants:
1. That difformis is a very good startup plant, I always appreciate that.
2. Those both swords will get giant and the one in the back will be a big pain in the tank by the time.
3. Lotus will also be a problem if not dealt properly and will form large floating leaves.
4. Both sword and lotus may have a shading effect in the future and plant your other plants accordingly, you would not want hc and grass to be shaded.
5. I usualy plant those kind of shading plants into very back sides and corners of the tank.
6. Consider also puting a driftwood in contrast with those stones.
Sorry for the posting the same message twice. It seems that I pressed twice to the submit button.
YILDIRIM | 
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