Some kind of teak wood would be best. IPE is what this looks like. Please purchase responsibility as it is harvested by clear cutting in some areas. FSC is best.

Suchitha, Your ask of no compromise on sunlight/ air circulation loss and at same time checking insects/dust is not very feasible. Pigeon net in transparent threads the best bet to check pigeons. Glass and ACP panelling will check insects, dust etc but cut down air circulation. Transparent blinds would require a lot of attention and not a foolproof solution. Thanks, Nitin Cornerstone Designs, Bangalore.

HDF is High Density Fibreboard as opposed to MDF which is medium density fibreboard. If sealed properly it can be used outdoors as panels set within hardwood frames. Better still is marine grade plywood

Farooq, First one is a glass finish Subway tile. It looks good but many people back out due to budget issues as it is relatively costlier. Second image is of a brick cladding wall paper. However, similar looking ceramic tiles, mud tiles are also available locally. IMHO, red brick sand tile gives a more natural effect.What suits better would depend on the overall design of the house. Thanks, Nitin Cornerstone Designs, Bangalore.